Okay so I skimmed Ch.9 Section 4 of his paper. I'm not really qualified to say whether he knows what he is talking about, but it sounds valid. Furthermore: holy crap, it would be so incredible if he were right.

On a different level: I'm really inspired by this article, because I didn't even know there were people out there who were thinking about problems like this. It really gives me hope for my own intellectual ventures as well as for the future of humanity.