No, that Greek website is not presenting the "official doctrine" of the Orthodox Church on that topic in such a way that necessarily contradicts with the legitimate Orthodox belief that all could possibly be saved. You’re acting as if believing in the possibility that all can be saved is some fringe viewpoint, as if something that St Gregory of Nyssa believed could be characterized in such a way, which is ridiculous. The belief in the possibility that all can be saved is something that is not only ancient in the Church, but I bet if you poll Orthodox Christians including clergy worldwide, most would believe in it. Maybe the vast majority. I kind of seems by the way you keep on adding "Greek" that you haven’t learned much about the original Christian Church.