I would say the appeal to authority was in the post I responded to: "the author is a physicist". I was simply pointing out that "physicist" is a broad term, and the fact that he has that job title doesn't automatically make him knowledgeable about the specific subject area in question.

As for the actual article, I think it's too vague to even be able to criticize anything specific. It's words strung together, but no actual testable model that I can see. (One key red flag: the page where he says the "mathematical details" are--does not even have a single equation.)