The study isn't saying that there are no genders - specifically it is saying:
Our results demonstrate that regardless of the cause of observed sex/gender differences in brain and behavior (nature or nurture), human brains cannot be categorized into two distinct classes: male brain/female brain.
Nothing in this view says it's not possible that, for example, an interest or a skill for engineering, while rare in both genders, might be n times more common in men than in women.
Here's some directly-relevant literature, which points to a systematic preference for occupations in men vs women: [0]
[0] https://www.researchgate.net/publication/38061313_Men_and_Th...
aphextron didn't elaborate on the source of the psychological differences. I was pointing out that it wasn't biological and most likely cultural.
BTW it's not even debunked from the biological perspective. It's debunked from a brain anatomy perspective.
This was largely debunked from a biological perspective [1]. Any psychological perceptions you may be referring to are largely cultural and subject to the biases that this product is trying to combat.
[1] http://www.pnas.org/content/112/50/15468.full