Is any of this accepted physics?

No. The Wolfram model is a research proposal, not established physics — it has not derived the full Standard Model or made a confirmed novel prediction, and it remains outside the scientific mainstream. On this site, claims are tagged to keep that honest: [setup] marks a modelling choice, [derived-in-model] a result claimed within the framework (not necessarily verified against nature), and [conjecture] an aspiration or analogy. The recovery of features like space, curvature, and relativity is the hoped-for payoff, and much of it is still conjectural or model-internal rather than experimentally settled. Critics such as Scott Aaronson and Daniel Harlow have argued the framework is flexible enough to fit results after the fact, and that the successes so far are "at best, qualitative."