I was about to make a comment about, how a double pendelum can swing in an infinite amount of unpredictable ways, none of which will suddenly turn it into a car. But I like your analogy so much better.
And even an infinite number doesn't mean all. There are infinite numbers between 0 and 1, none of them is 2. So the multiverse wouldn't have to include one that contradicts its rules.
Maybe in the sense that the people there haven't thought of the theory itself. But one universe can't affect if a multiverse exists or not, one universe would just be part of a whole
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.