Yes, it really is.
He's not just as wrong as he is right, that's just factually incorrect.
It's also not guessing because it's based on a statistical analysis. Perhaps what you are trying to say is that his statistics do not generate results that are better than guesses, but again, that's factually incorrect. His model produces a pretty good result actually.
But your lambasting of the Athletic as "holier than thou behind a paywall," makes me think you have another issue with the publication or with analytics in general, which is also unfounded.
Your general discrediting is an overreach. Statistics and analytics are not perfect but they are far from worthless and Dom's model isn't worthless either.