This is true. The physics outside could be anything and we're unlikely to understand it. There's a chance us humans are simulating our past for some unknown re

This is true. The physics outside could be anything and we're unlikely to understand it. There's a chance us humans are simulating our past for some unknown reason - in which case one would expect the laws to be similar. It's also not unreasonable to think that there will be many similarities between the laws of the simulation and the outside reality because they'd have what they know to draw on for inspiration.