I have a phd in astronomy and I spent some time reading it yesterday. I don't think he'd think much of it. The theory seems to be aimed at explaining the existence of cosmic voids and the structure of the cosmic web. But these are pretty naturally explained by lambda CDM. And if the goal is to explain away dark matter, there are other pieces of evidence for dark matter that wouldn't be explained by this theory. At any rate, as far as I can tell it's not a quantitative theory so it would be hard to tie it to observations.