kurokikaze comments on We are not living in a simulation - Less Wrong
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Basically I'm asking: is gravity "real for all bodies inside the system" or "real for all bodies inside the simulator"?
If the former, then we have Tegmark IV.
If ONLY the latter, then you're saying that a system requires a means to be made known by someone outside the system, in order to have gravity "be real" for it. That's not substrate independence; we're no longer talking about its point of view, as it only becomes "real" when it informs our point of view, and not before.
Oh, I got what you mean by "Tegmark IV" here from your another answer. Then it's more complicated and depends on our definition of "existance" (there can be many, I presume).