So I was little confused until I realized the source was a libertarian outlet. If it wasn't obvious from the piece, the popup asking for donations to fight "socialism" should be the nail in the coffin. This explains the extrapolation of data and drawing broad conclusions from it. They seemed to have enter the article with a bias that disability only means physical and that most if not all mental disability is a personal failure. It further fuels this by finding a professor who makes the claim that a large part of the student body is just making up disorders. They of course assume that doctors are widely handing out diagnoses without proper scientific backing. Which is a huge leap to make. There is a similar positive and negative stereotype that children en masse are taking Ritalin and other ADD meds to pass classes.
It reminds me of the transgender "debate". That the medical establishment is someone acting contrary to science. That all of these people with years of training are part of a conspiracy to hurt children. Not surprising that this sentiment is popular amongst libertarians and applied to other students. It's disappointing to see so many echo it's sentiments without critically thinking about the piece.