I don't think that's Feynman's point, no. For one thing, it would be impossible to be a theoretical physicist without having a tremendous amount of buy-in to ma

I don't think that's Feynman's point, no. For one thing, it would be impossible to be a theoretical physicist without having a tremendous amount of buy-in to mathematical realism. That he, for example, believed in things like particle symmetry points to a far-more-than-contingent belief in the reality of mathematical/scientific objects. I think Feynman was just the archetypal "everything is a subset of physics" physicist, who thinks philosophers just play at science. This is obviously not from the linked article, but it's the sense I have of him from his memoirs.