Reading through the article - the source data is 1,500 people. Not insignificant, but reading between the lines at some the criticism outlined - it may be the case that those 1,500 people were chosen selectively in a way that could bias the conclusions (maybe unintentionally).

I would love to get data on where my brain is at! I myself have no gender (like how some people just don't have a religion). I have a sex, and an orientation... just no gender.

But yeah, more data is needed to take this study seriously (reproducibility for one).