I wouldn’t say we can know we’re in a simulation; there are too many possible sim blockers to be sure of that. I can’t know for sure that humanlike simulations are possible. Perhaps consciousness is substrate-dependent, or physical processes are uncomputable. And I can’t know for sure that if these simulations are possible, humanlike populations will create them. Perhaps almost all of them will go extinct or avoid simulations. So I can’t know for sure that most humanlike beings are simulated, and I can’t be confident that we’re sims.
