I read most of the study and IMO it seems to be legit in terms of methods and structure and ethical concerns.
When I've read incel type subs or forums there is just such a high number of them who seem to have no social skills at all when it comes to women. And this could be because they tend to be on the autism scale and were bullied as children as this study states.
I really believe that if they were given mental health support, including intense support for their autism, they might be able to turn some things around. The study didn't ask them if they are autistic, it used a well known screening scale used to determine whether a person needs to have a full blown autism assessment.
It could be that many of them don't know that they are on the spectrum which is really sad.
When you see their descriptions of how they try to interact with women, it is painfully obvious that they have no idea that they are unwittingly setting off women's internal safety alarms.
There was a sub for incels who were willing to accept help and actually trying to get better. The other thing I noticed is that most of them think that their face is repulsive. They are very obsessed with facial structure, and some of them spend hours on plastic surgery websites looking at the features that supposedly make someone handsome and then comparing their faces to that.
They seem to have a kind of facial anorexia. I even asked a couple of them if they wouldn't mind sending me a photo of themselves. I explained that I'm old enough to be their mother and I work in mental health and want to help them, not trying to hit on them. These guys were above average looking. Just cute normal looking young men.
I would tell them there is nothing wrong with you, you look like a normal man your age and you are not unattractive.
I think they get bullied and rejected because of their autism traits and they don't realize that is why. I think that's part of not seeing social cues maybe. They assume it is because of their looks, not because humans are for the most part assholes who treat "unusual" people who don't fit in like crap.