I don't understand why is simulation even necessary. Simulation argument says that our universe and consciousness is pretty much just some sort of mathematical structure, that is being manipulated according to some simple laws as it evolves through what we call time.

But then, isn't the only requirement for beings inside this structure to perceive it as such that the structure exists? Do you need to really physically manipulate it?

To put it differently, what if the designers of the simulation could come up with some theorem that would let them correctly skip hundreds of years of simulating something. Would beings in those hundreds of years still existed, even though it wasn't actually executed? What if they just calculated the final answer? Would we then exist?

So, to me, either this is nonsense, and we are not in simulation, or, any kind of mathematical structure that can possibly exist somehow "exists" and no "creator" is needed. But neither of those two options is a good argument for existence of simulation creator.