If we're in a simulation, you have no basis for drawing conclusions about any of our observations, whether those observations have taken place, whether anything outside of this moment exists, or anything outside your mind, or both.
The notion that non-determinism can be proven, exists, and/or has a relevance to a simulation all make assumptions about reality that either won't or don't have to hold if you're in a simulation.
The notion that non-determinism can be proven, exists, and/or has a relevance to a simulation all make assumptions about reality that either won't or don't have to hold if you're in a simulation.