Very interesting to explore, starting with his bold assumption that anti-matter and matter are gravtiationally repulsive. That seems to lead down many inetresting corridors with delightful consequences to attempt to disprove.
They're observable particles. They probably wouldn't fit unless it somehow turns out to explain the entire Standard Model. What I'm getting at is that it might explain some dark matter, but it is unlikely to explain all dark matter even if it turns out to be a correct model.
That whole thing about neutrinos oscillating between flavors still freaks me out though. One of the weirder things in quantum mechanics.
There are also things like neutrinos which wouldn't fit.