And you fall back to the same straw man nonsense. The nature of the matter is philosophical and it specifically includes also everything that is unknown to us.That is beyond the scope of anyone's reasoning.
You propose everything that exists is known.
So it's a flawed question.
I'll not answer you again.
In classical physics everything that is known to exist is in this universe. So for it's worth the term is universe or macrocosm.
How many times does "absolute totality of all known and unknown existence" need to be repeated to you?
You run circles around the term "known universe". So now for you the terms "Universe" and "known universe" mean the one and the same thing then? Is that the case for you?