To add to what Salpy has said, I want you to consider the fact that the article you link to makes no mention of the salvific role of baptism which the mind of the Church, accurately expressed in the view of His Holiness on this matter to which I have appealed, deems central to understanding the verse in question.
The author of the article saw it fit to conveniently ignore the immediate context which His Holiness highlights; namely, the very next verse which specifies the manner in which the entire household could be understood as being on some level saved: "immediately he and all his family were baptised."
I do not think it a coincidence that the author who so ommitted to make mention of this qualifying verse and its implications is one who elsewhere on the website explicitly disavows the salvific efficacy of baptism, deeming it a mere "step of obedience," the efficacy of which is, according to our author, solely contingent on some vague notion of a public confession of faith. A further implication of this would be that he denies the efficacy of infant baptism in particular.
So, all in all, we can see how our author not only fails to capture the true Orthodox understanding of the verse question, but even worse essentially denies and opposes the very heart of it. So please be careful. His Holiness Pope Shenouda has written many very simple, terse and reliable contemplations and commentaries on the various Scriptural verses that people often question the true meaning and implications of; my suggestion is that you consistently refer to these. Such commentaries/contemplations are generally scattered throughout all his works. He has not, as far as I am aware, written whole commentaries on specific books of the Scriptures.