Just skimmed the copy you sent me. I like it! ISTM that like Schmemann and Meyendorff, Fr Georges was one of the 'good-guy' Russian Orthodox from a Catholic POV, not Modernist but basically mirroring the Catholic Church's view of sacraments outside the canonical borders of one's church, as opposed to the strict interpretation of St Cyprian and some Eastern Orthodox today.
An example of how he was not Modernist: he agrees with Metropolitan Anthony (Khrapovitsky, former metropolitan of Kiev and founding first hierarch of ROCOR) and disagrees in advance (Fr Georges was writing in the 1930s) with dissident RC Edward Schillebeeckx (late 1960s) about taking economy too far and declaring that the Church can dispense with administering the form of a sacrament altogether since, in ES's words, the Church is sacrament (and thus can basically do what it likes). This was the same dodgy thinking behind the attempted Anglican-Methodist reunion in 1968 (the thinking was if the Church is sacrament, then by fiat it can declare Methodist ministers to be priests!) and led one commentator (I think the late, great Fr Eric Mascall) to say, sarcastically, it could be applied to Quakers in a reunion scheme, simply declaring them all baptized! No va - it doesn't go.