So you're saying, what if MWI is just a local phenomenon to our world, and doesn't apply to these 3^^^^3 other simulations that the matrix lords are working with, because they aren't quantum in the first place?

I agree that in the case of a mere galaxy of computronium, it's much less credible that one can simulate an extremely high number of people complex enough that we wouldn't be able to prove that we aren't them. In the former case, we've got much less information.