I will advice you to stop with your nonsense. Simple and straight question for you:No, I accept it that you aren't saying the same thing he is ,
and that cosmology and astrophysics don't say the same thing you do. He explains observable vs entire here(note there is no distinction between U and u).
Accept the fact there could be more of them. You know plural
Do you have a term that encompasses the ***absolute totality of absolutely all existence***?