Earlier quoted context omitted.
I don't see how adding a simulation/God solves your issue? If a system cannot be self prescriptive/be without axioms/ (whatever you think the issue is) then adding another layer of systems is not going to solve your issue. If it can be, adding another layer is not necessary.
Yes, it would need to be qualitively different Simply to be able to simulate the universe, or provide a basis for (however we describe the issue) already needs to an excessively stupendous amount of power -- but that is something still within the realms of physics I was suggesting (as essentially do you) that to break out of the nested simulations (or whatever formulation) takes something qualitively different to wha…
I guess it just comes down to semantics then. I would say that, by definition (but I'm not sure if this is the most common definition), anything that can act upon the universe is part of it. Your God/simulator/... might be alien to us, but by definition it is part of our universe, and it's just us that do not entirely understand the capabilities of the universe.