Must be nice to have such certainty. Given a universe of many different dimensions where we are stuck living in 3 of them it such does a nice job of explaining what we are seeing but to each his own.
It’s easy to have certainty on that point, given that not a shred of actual evidence for the existence of extra dimensions has ever been discovered.
So yes, I can toss a totally baseless fantasy out the window with extreme confidence - you can bet the farm on it.