This article is an opinion piece posted 31 March 2015 on a blog, by a student at Penn State (Sarah Vlazny). It is not a peer-reviewed academic journal publication, so nobody at Penn State reviewed either her facts or her reasoning. Specifically, it is was not approved as an official statement by any qualified academic at Penn State."Their practices seem to have no scientific backing, only the written work of Ron Hubbard. "
It starts off with the standard critic Fallacy of Origin about Scientology: Hubbard wrote Science Fiction, therefore Scientology is Science Fiction and goes down hill from there. This woman is merely parroting a list of anti-Scientology critic talking points while lacking any personal observations to add to the discussion.
So there you have it. Riddick attempted to persuade the reader using recycled critic rhetoric and used a false appeal to authority in the process ("interesting post by a .edu").