"Well I can tell you there's a multiverse, and a lot of stuff lives in it." Though he couldn't say what was in Damien's version of space, Bowser was certain of the existence of other dimensions, which is true no matter what reality one resides in.

"But the people here are all seem like they're from different worlds. So you can't really say it's just theory anymore, can you?" Even if this was a simulation, which Bowser very much doubted, he was certain interdimensional travel had to be at work.