I had a quick read of it. It's very badly presented and there are even unfinished sentences. I didn't find it plausible, and I'm amazed that at no time does he give an equation for the interference patterns, not even the classical wave example.
But, the fact that one can get 'interference' patterns by letting some billiard-ball type objects interact with the slits in a certain way, is not a refutation of standard QM, nor a simplification.
He tries to extend his model to other phenomena, but there aren't any equations, just words.
I don't think he's a crackpot, he just doesn't seem to have studied QM/QFT very deeply.