I think you are hyper focusing on one very small paragraph title. The same paragraph labels it as a theory:
"A theory that the core problem is that most men are terrible in relationships even when they are superficially fine, women learn this, and thus men whose selling point is their stability cannot get dates."
Most of the article I find is mostly gender neutral. It also contradicts the usual claim that women/men will have to go on dates with an endless amount of losers:
"There is the stereotype of the person (usually but not always a woman) who goes on dates constantly, finding an endless string of losers. The data here suggests that this essentially is not a thing, or that if you do that it works."
There are definitely articles blaming everything on men but this article is not one of those.