>There is zero chance his theory has any merit.
That seems a bit harsh. There is a certain beauty in the geometry equations Weinstein presented. I find it interesting that EFE, Yang-Mills and Dirac emerge from that. He certainly hasn't shown a complete theory of everything but I wouldn't say that it doesn't have any merit.
If I had one criticism of Weinstein it would be that he's never put anything down on paper for anyone to deeply review.