While I'd agree that the article itself is mediocre, it does list all its sources, which seem perfectly valid. This is just a shallow dismissal and an appeal to authority. It irks me how some people think it's impossible to have enough expertise to contribute to multiple fields without some formal pedigree. That may be true for you, and may even be true for the author of the article, but it's not true as a generalization.

If you're going to shit all over someone's work, at least come up with legitimate reasons.