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.
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.