The reason I am toying with you is because you fail to separate linguistics from epistemology.
In English "The Universe" is a proper AND collective noun for all the things THAT exist!
It is the boundary (edge case https://en.wikipedia.org/wiki/Edge_case ) of epistemology. To falsify the claim "The Universe exists" you need to make an observation of a non-existing universe. Which is redactio ad absurdum!
Anything that is untestable/unfalsifiable yet it is ACCEPTED to be true is an axiom. A tautology. Try it. You will see I am right.
The statement "The Universe exists" is expressed in logic as a single symbol: U - thus, axiom. First assumption.
Logic does NOT work until you allow SOMETHING to be true. It's a non-starter!
This is the strict criterion for Verificationism ( https://en.wikipedia.org/wiki/Verificationism ) and its weaker form confirmation.
Verificationism bridges the gap between logic and empiricism.Verificationism, also known as the verification idea or the verifiability criterion of meaning, is the philosophical doctrine that only statements that are empirically verifiable (i.e. verifiable through the senses) are cognitively meaningful, or else they are truths of logic (tautologies).