Earlier quoted context omitted.
The secret that is rarely revealed in pop science discussions is that theories of everything are cheap . To count as a theory of everything, you just need to come up with any mathematical structure big enough to cram the Standard Model plus a graviton in. And adding mathematical structure, especially when you're playing around, is easy, like snapping legos together. In this way, you can crank out ten theories of ever…
You have a couple threads going in here, so maybe you tacked this to the wrong one. You said you could speak for sure about things he'd said about physics, so I'm asking for those specifics.
(You could criticize the little there is on aesthetic or philosophical grounds. I tried to avoid this because that's subjective, but it is true that there is a great deal more arbitrariness in his construction than in alternatives. For example, string theory also has a lot of extra dimensions, but the number of them is fixed by internal consistency. It wasn't just made up.)