In fairness, that part of the article seems like it might be an invention of the author, who probably is not all that qualified to develop a psychological inventory. I'd expect an instrument based on the described paper to be considerably more extensive, and presumably able to control for distinctions like these.

That said, I realize this is psych research and, in light of the ongoing replication crisis, may deserve somewhat less benefit of the doubt than I am giving it in this comment.