I think that this leaves the question unanswered, and that (say) Dennett, or possibly Turing, would argue that the “internalism” is itself an open question even for those of us who claim we have an internal model.

“there’s nothing inside [the Roomba] but cat hair and dirt; I know because I’ve looked” — okay, Dr. Fodor, but if you’re going to be clever like that then prepare for a visit from some intrepid neurophilosopher with a bonesaw and curiosity about the contents of your cranium: “Clearly, Dr. Fodor has no internal model: there’s nothing inside there but gray jiggly goo — I know because I’ve looked.”