Is a random description of a card game add even canon?
That aside, I see nothing that really convinces me of Tier 1.
The transcendent statement doesn't pass our standards on transcendence clarification.
The root being infinite, if that statement is to be taken literally, would just make it... infinite. Not uncountably infinitely bigger than the worlds that are part of it.
So what we actually have is just a structure connecting lots of realms. That can still be within multiversal tiers (assuming the realms are universes). Like, a 3D object can bend through 4D space to connect different 3D spaces. Or, to make it easier to imagine, the surfaces of two papers can be connected using the surface of another strip of paper, by that connecting 2 2D things through 3D space, via another 2D thing.