The evidence for High 1-B is frankly extremely weak, and from what I see:
Hinges entirely on the supposed distinction made between "universe" and "dimension" in that of dialogue, which in turn is reasoned to mean that they are referring to distinct things. Except that, if you look at the actual quote, you'll see that the "incalculable dimension" and the "glorious universe" are the same subject:
It's literally just using different terms for the same thing, and otherwise there is not the slightest indication that it's talking about infinite spatial dimensions in here. That reading wouldn't even make sense, anyways, since a spatial dimension is not a place, so it's nonsensical to describe oneself as being "from" one. If the quote said "We are from an incalculable dimensionality", there'd be a good argument, but that's not what is said.
So, yeah, unless I'm missing something, this is totally bunk.