I don't believe that changes anything at all, no. Overall, over the course of the above dialogue, there wasn't really anything going against the idea of a High 1-A+ key for God's manifestation at all. Here, you said:
And I think the answer to this is pretty straightforward: The Magician, insofar as he is God (Which everything and everyone is, at the core), is not limited by the illusion. But the Magician, insofar as he is manifested at all, exists in the illusion. So, in one respect, he is Tier 0, but the respect in which he is Tier 0 is precisely the respect in which he is not manifested as the Magician, to begin with.