So, is the argument that a temporal dimension that encompasses a multiversal cosmology (multiple universes with their own respective temporal dimensions) embedded within an unquantifiable, but undeniably 5-D space, is Low 1-C?
Yes that is right.
I can agree with that, if that's what is being argued.
Though, I'm unsure if I'm missing something, but I haven't seen any evidence of there being this second temporal dimension that is encompassing the whole structure.
It was from a scan that was pretty blatantly implying it was a totally different dimensional space, and even calling it a separate space would have been efficient enough, because in DB, spaces have been referred to spacetimes, but here is the translation from the guidebook.
12 宇宙とは異なる空間に浮かぶ惑星
Planets floating in different spaces from that of the 12 universes
As I said before, calling "different space" (異なる空間), does sound more how they call what is generically here a different dimension, especially considering that they put stuff like the World of Void.
Also, looking into the complete scan
They put the nameless planet in the "neutral space between universes" in the same "space different from that of the 12 universes" as the World of Void and Zen'O palace. So yes, here it's completely in the meaning of a different dimensional space and can be used as proof that the neutral space between universes is like a "neutral dimension between universes", unless the World of Void is now seen just as another part of the same universal space that all 12 universes share and you can get there with a spaceship.
Translation by
@Executor_N0 about the neutral space between the Universes
The 5-D "space" here can't really be tiered even if it is 5-D as it is most likely just a not-measurable void without anything quantifiable to speak of.
However, if there is in fact a temporal dimension that surrounds neutral space, it would be Low 1-C for having two distinct temporal dimensions on top of an at least infinite 3-D space.
Exactly, the neutral zone has been decided as unquantifiable 5-D, with it having its own temporal dimension, that qualitative superiority requirement has been reached. With also even that being under a higher time flow, so it should arguably be even higher, but it is low 1-C at the least here.