The impossibility of being sure of the rules of the parent reality is why I find all arguments that we can't be in a simulation because it would take too long t

The impossibility of being sure of the rules of the parent reality is why I find all arguments that we can't be in a simulation because it would take too long to calculate certain aspects of our reality to be unconvincing. The computational complexity hierarchy could be different in a parent universe. I do wonder though what things might have to be the same. I would be very surprised if any reality that allowed intelligent life forms able of creating and running simulations didn't have causality. What about the concept of number, or certain parts of logic? I think there may well be reasonable assumptions that can be made about a parent universe, even if they don't reach the level of complete confidence.