It's really an umbrella term for a class of theories, some of which do make testable predictions (like anisotropy of space or, in this case, a minimum bound on

It's really an umbrella term for a class of theories, some of which do make testable predictions (like anisotropy of space or, in this case, a minimum bound on memory error rate with zero radiation.) It's like the term "string theory". One thing that all simulation theories predict is that our universe is interesting. It's an alternative to anthropic theories to explain why our universe is one with life and not one that re-collapsed to a singularity or expanded out into a thin hydrogen plasma. See https://en.wikipedia.org/wiki/Fine-structure_constant#Anthropic_explanation https://en.wikipedia.org/wiki/Fine-structure_constant#Anthro... for one reason why it's only a small range of possible universes that are interesting.