I kind of sympathize with the author's snarky change of title, but I would have used "class prejudice" rather than "racial discrimination". The paper reminds me of Victorian "research" showing that criminals have differently shaped crania from "normal" people.

Perhaps all they're detecting is that the criminal faces are mugshots, and the subjects are stressed and unhappy. They look upset. The noncriminals are all wearing a suit and tie, and look relaxed.

I am certain that the research is spurious.