This article makes a tremendous amount of sense.
Academic credentials are important, if only because they provide a useful heuristic to learn more about a topic. Since you have to start somewhere, it makes sense to listen first to the people who are paid to teach and research that topic. Ultimately, however, the validity of scientific claims depends on the arguments and evidence in their favor.
Thus, if someone makes a claim he can’t substantiate with good arguments and evidence, his credentials should not matter. Conversely, even if someone has no credentials, without evidence of substantive incompetence, this is not a reason to reject his claims.