What's the difference between a clock and a computer? And there's no difference between computer and computer simulation.

Being a hologram is something I see as a significantly different type of comment. That's about how a sphere of space is mathematically equivalent to a flat 2d shell using equivalent but warped physics. It doesn't change anything about the nature of the universe except sort of the number of dimensions. And it's orthogonal to those ideas.

I'm not sure how to categorize the graph thing but it's not widespread at all.