None of us seem qualified to judge this paper as valid or not valid or to say which parts are valid and which aren't and why.
But the only active thing we can do in Hacker News is leave a comment and this article tickles with me enough to want to leave a comment.
I guess the best comment I can leave here is one that avoids the ignorant-about-own-ignorance pitfall of false expertise and just leave a meta-comment about the comments.
They're diseases of the superego, not social or cultural diseases.
It makes no sense to say that a culture or society can directly bring about mental illness, but it makes sense to say that a person's superego is influenced by society and culture, and it makes sense that the superego can make a person mentally ill.
Otherwise, people will (correctly) argue that society and culture doesn't have that much power over a person's psyche.