I agree with the uniqueness of consciousness. Obviously no entity poofs into existence imagining itself adding two numbers when I execute that operation, and I don't think this changes whether one carries out 1, 10, or 2^1000 operations.

However that doesn't preclude 'my' version of the simulation hypothesis. Imagine you were in a full body VR sim from the moment of birth, that artificial reality would likely simply be reality to you, yet your consciousness would remain. So all that's fundamentally required is some tech to temporarily block all past memories before entering the sim.