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Doesn't this simply suggest that the reality that is simulating our universe would have to be fundamentally different than our own?

I remember reading something a decade or so ago which said that to simulate the entire known universe, even using selective windowing, would require more energy than the entire universe has. Wish I could remember the source.

This only applies to classical computers not quantum, some combination of both, or by some means of computation we haven't discovered yet.

No: https://www.scottaaronson.com/blog/?p=3482.