These are the specifics. There isn't enough there there in his theory to have anything more to criticize. That is, it's too vague to even do the zeroth-order tests physicists would use to decide whether to take it seriously.

(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.)