Your question is a rather complex one to respond to, concisely. The term canonical, refers to the canons or rules of discipline that were formed by the Church in the first millennium.
Understand that what we know as the Eastern Orthodox Christian Church today, is a group of Churches which are governed internally, within themselves, and are united by their oneness in Faith, Doctine and the Sacrament of Holy Communion. This internal government is referred to as autocephaly, essentially meaning, they elect their own leader, without the need for a confirmation of approval of the leader's election, from a superior ecclesiastical authority; another synod. Parishes are grouped among dioceses, under a bishop who processes full ecclesiastical authority over the priests, deacons and faithful within the parishes. The bishop is a member of a synod of bishops. One member is considered the "first" hierarch. He presides over the synod, but does not rule over the bishops. The synod deals with matters of common concern among the bishops and dioceses; however, except for matters that come within the purview of a spiritual court, typically, the synod wouldn't interfear in the activities of a diocese. The synod may be a regional synod, if it has not been granted autocephalos status. A regional (provincial) synod is subject to the synod of the autocephalos Church. There are variations to what I've written that will complicate this discussion even more than it already is complicated.
Orthodox Doctrine was always believed to be in the conscience of the Church, but when disputes arose, after the Constantine the Great ended the persecution of Christians in the early 4th Century in the Roman Empire, theological disputes, such as to the nature of Christ, questioning his dual nature, divine and human, for instance, arose. Thus, all the bishops of the Churches were gathered in an Ecumenical Synod wherein, they defined, what the Church already knew; Doctrine, something all the faithfull are required to believe and adhere to.
To get more to your question, Orthodoxy believes that the Apostles ordained bishops to lead the faithful. All canonical bishops can trace their ordination back to an apostolic foundation. A synod authorizes an episcopal ordination, for which, no less than three bishops should perform the ordination. It is the canons which set forth these rules.
There are -15- or so, generally recognized autocephalos Churches today. To the Ancient Churches of Constantinople, Alexandria, Antioch and Jerusalem (Rome was the first in primacy, but when she excommunicated the Patriarch of Constantinople and his followers in 1054 AD, she was no longer considered Orthodox), have been added, the Churches of Russia, Serbia, Romania, Greece, Bulgaria, etc. These Churches maintain this common traditional doctrine, formulated by the Ecumenical Synods in the first millennium and accordingly, they enjoy communion among themselves. This oneness is manifested, in part, by a priest's commemoration of his diocesan bishop during the Divine Liturgy, the Eucharistic service of the Orthodox Church, at the petition, "First of all, be mindful of our (bishop or archbishop)_(name)_, grant that he will serve thy Holy Churches in peace. Keep him safe, honorable and healthy for many years, rightly teaching the Word of Thy Truth." The diocesan bishop, in turn, at that petition, commemorates the "first hierarch" (sometimes called, primate) of the synod to which he's attached; while, the First Hierarch, commemorates, the first hierarch of the governing synod, of which the regional synod is under. The first hierarch of the governing synod, the autocephalos Church, commemorates all the First Hierarchs (presidents of the synods) of all the autocephalos Churches, referred to as the Holy Churches of God, in the liturgy. This is a witness to the oneness and communion among the Holy Churches of God.
Now, if a hierarch is not a part of the system described in the above paragraph, some of the Holy Churches of God will consider him not canonical; functioning outside of the disciplinary canons. However, there are also canons that permit a bishop, to "set [himself] apart," in resistance to a bishop (or synod) who he considers not right believing; not preaching or practicing consistent with the true doctines of the Church. There are movements such as this in the Church, today. Most of the movements have separated themselves from what they consider the "heresies" of the Ecumenical Movement. While these synods in resistance are not recognized by most of the Holy Churches of God, (they do not enjoy the sharing of communion) some are accepted by one of more of the autocephalos Churches. In 1992, at the Ecumenical Patriarchate in Constantinople, the presidents of all the synods of the autocephalos Churches, on the First Sunday of Great Lent, the Sunday of Orthodoxy, issued a letter condemning such movements. The Patriarch of Jerusalem, entered an objection to this condemnation into the record of the proceedings.
Finally, there may be purely self proclaimed priests or hierarchs, self ordained, or priests, ordained by self proclaimed hierarchs, not affiliated with a synod such as was described two paragraphs above, who are not in communion with anyone, and are generally considered non-canonical. Due to court rulings over church property disputes in the United States in the first half of the 20th Century, Orthodox Christians have been counseled to refrain from deeming churches, non-canonical, due to disputes as to whether a jurisdiction can be considered canonical. Perhaps, simply acknowledging that they do not share communion with the autocephalos churches is closer to being more appropriate.
In the Western Hemisphere, the Standing Conference of Canonical Orthodox Bishops in the Americas was formed, in part, for the purpose of recognizing canonisity among Orthodox jurisdictions; however, due to political and administrative disputes, there are canonical jurisdictions which are not affiliated with SCOBA.
I am not familiar with the hierarch you noted in your post and, therefore, I cannot comment as to where he may fit into the scenarios outlined above.
(I am not a clergyman or a theologian.)