it is most of the way it is applied here, rather than has a concept, which in reality, does not sound that bad or different from a higher dimensional space.
but man, don't you know how extremely vague it is that they apply this? I mean Dragon Ball has it (in this wiki) but the same verse does not give an explanation or tells you that there is a higher dimension of time, or at least it gives that implication, we simply take it as if it is accepted and that's it.
like, there are 12 universes, ok?but all of them share the same timeline, so we just assume there is some higher time axis to explain why all this space-times have a timeline of their own, instead of just, you know, not doing that many assumptions?