Indeed, in these debates i often wonder what the hell i am talking about...
As i understand BTS and DD, they seem to distinguish between 'our' universe, ie. the space-time and mass/energy that came into existence (lets not split hair here) in the big bang, the laws of physics we are governed by, etc and 'Gods' universe (what i call the 'meta-universe') that seem to be 'eternal' (what that means) and may follow a different set of rules.
I want to add that the existence of such an universe is not something i am convinced off is a given thing; infact i can feel i want to avoid it in every way because it seem like a very ugly concept to invent a universe as a 'deux ex machina' that fix every problem! But this is way above my paygrade and i dont want to commit to one side or another on that question.
However, since BTS and DD use these constructs i assume they exist and see where that leave us. Personally, i dont feel the existence of a meta-universe is the weakest link, it is why such a thing would be God.
When i wrote your definition was a 'poor' i think you misunderstood me since english is not my first language. I ment to imply: 'You MAY be right Darklighters definition is not the right one in the context of this discussion'.
The definition you use is also the one i would normally use in a different setting. I also think i made it clear that i believe the definition is consistent and i fail to see why it provide a contradiction as DD seem to imply; that is at least what i ment to write.