Nope. I said it had been alluded to and that it wasnt a stretch given that its acknowledged as being responsible for the creation of multiple realities in the multiverse and the fact that there is a central Phoenix Consciousness at the heart of the multiverse that has avatars to perform Phoenix work across reality. Its not really a stretch but given the feats the Phoenix has been shown to be able to achieve its irrelevant to my argument to have that point under my belt.
Im just saying that the Phoenix is a multiversal force, it has avatars capable of beyond universal feats (Jean) whilst still being able to power avatars across the multiverse.
The Phoenix is acknowledged as the power that spawned a variety of universes in the multiverse so given that what makes all of the universes of Marvel a multiverse is their shared cosmology and similar nature to each other its not much of a stretch. Either way as i said its definitely alluded to, but alas not confirmed
But given the feats a single avatar is capable of and given the Phoenixes stated role in Marvel i really dont need that point to win any arguments