[AngrySkillzz]

I think the parent commenter more closely means meta-reality. There is sort of an ongoing debate in science/philosophy over whether our not our Universe actually computes at some level; it looks like it might, but there is no reason a priori for us to believe it does compute and doesn't just seem that way.

To claim that the Universe is a simulation means that it would be the result of some computation. Depending on your interpretation, this could mean one of two things: that the Universe does ITSELF compute, or that there is some "computer" which carries out a computation resulting in the Universe. The second is what I think the parent commenter is thinking about. In that case, where does this "computer" exist? It's certainly not in our reality. This would imply that there is some meta-reality that contains the "computer" which computes, and thus creates/contains, our reality.