[Serious] Non-binary

[Paleophyte]

I think you should read further into the article. There is a great deal of discord regarding the nonbinary concept, and yet even this article does identify it as gender dysphoria. Seems some people only read and accept what they want.

The Richards et al paper references gender dysphoria by way of the APA's DSM-5, which is where the term was defined. The DSM-5 definition of gender dysphoria clearly indicates that gender is non-binary. From the APA's Fact Sheet on Gender Dysphoria:

 - A strong desire to be of the other gender (or some alternative gender different from one’s assigned gender)

Emphasis mine.