From our universe, and simulations we can create, and simulations in there, etc. it holds. It is interesting to think that an outside universe could be so diff

From our universe, and simulations we can create, and simulations in there, etc. it holds. It is interesting to think that an outside universe could be so different it does not hold going up to base reality. But that implies that logic, math, and computability, are different there. That is not very likely, though ultimately unknowable to us. Literally "a mere shadow of what others think of as reality" implies that that universe has a lot more compute. Therefor with much higher probability you would have evolved directly in their universe, on some tiny pinhead, or in a corner of their universe, not in a simulation they create, no matter how many they create.