Why is that the null hypothesis? For one thing, the only experience we have is existing as bodies in a real world, so that should be the default with any other

Why is that the null hypothesis? For one thing, the only experience we have is existing as bodies in a real world, so that should be the default with any other claims being supported by evidence. For another thing, simulating a bridge falling down is not a bridge falling down, and it's not proven that simulated thinking is thinking (or even, possible).