I have no doubt that Robin Hanson is a brilliant man, and I am aware that he has an extremely strong physics background for a professor of economics, but it would seem prudent at this point for those of us who are not domain experts to have somewhat Bayesian anticipations regarding the cross-disciplinary adventurism of economics professors. People read his blog. If this thing is indeed a ball, there will be plenty of astrophysicists happy to pick it up and run with it.

This doesn't mean that you're wrong that the paper is wrong, but Dr. Hanson should absolutely not be our referent for certitude on the matter.