Going on the rule that the multiverse theory is accurate… Then I do believe that makes the end statement impossible.

The multiverse isn’t dependent on any single universe. So if multiverse is true, and a universe exists, it wouldn’t be possible for the multiverse to not exist as that would be a logic paradox.

Of course, it’s from a matter of perspective. Those in that universe might not be aware of capable of recognizing or conceiving the multiverse. But that wouldn’t alter it’s existence. Kind of like a one way mirror.