That's not how I read this thread at all. What GP is saying seems to be that when you assume you're able to simulate matter and physical processes down to nuclear level (so you can "simulate a rock" with it), it would be only a matter of giving that simulation enough resources in order for it to be able to simulate a conscious being.

How do you know you're not simulated yourself? Whether we live in a simulation or not does not really have any influence on us and our consciousnesses.