There is zero chance his theory has any merit. Why are some people so susceptible to this stuff?
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.
(In this particular case I don’t know the requisite theory myself but having experienced crank theories in areas of physics that I understand, it’s obvious this is the same.)
And Don’t forget Brandolini’s Law: https://en.wikipedia.org/wiki/Brandolini%27s_law