I think, just as no system is fully self descriptive (there is always an axiom), and there is no fully self contained perpetual motion machine So it is reasonable to take the universe as not fully self descriptive or defining For instance can the universe create it's own arbitrary laws of physics and run molecules on that basis? No it doesn't And so essentially, a simulation, or God becomes required. And the one runn…
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.
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 what this universe is able to even fully conceptualize
My placation to God (aka universe simulator runner), is to say that clearly this thing exists (else we don't) and clearly it must be different and outside the universe to an extent that we can't describe it
In the same way that a set can't describe it's aleph numbers
-- So in brief, I'm agreeing that another layer of simulation doesn't cut it