That does sound like a dumb article. Who writes this stuff?
I have no interest in the length of hair on other ladies. It's their hair and I've never in my wildest dreams thought hair length was related to mental stability.
I've always been fond of long hair on myself. The shortest I've ever had it aside from my early childhood was shoulder length, and that was because the hairdresser completely failed. I walked in and asked her to trim off 3 inches, and she took off 12 inches instead. HOW DO YOU DO THAT. I was so mad that I haven't had anything more than very slight trims since then. My hair now falls to my hips, and if the "discovery" that was made in that article is true, then I ought to be extremely mentally stable or something.
I'm not.. so clearly the article's claim is invalid.