There must be a reason the incels like him so much though?
Yeah, he's said some things they seem to identify as talking about them, though i'm not convinced they really are. The thing is if you ever read on their forums, a lot of them are very messed up people, deeply self-hating and often especially around their physical appearance. And not really capable of understanding other peoples reactions or motives. I don't know how well they really understand what someone like Peterson is really saying.
But he does say that in some ways young people have been put in a position where society doesn't really support or reward young people for getting into solid long term relationships. And I think he says that at a certain point this can hit young men particularly hard, especially since society also no longer teaches them what they need to know to be appealing as partners.
I think he says that for women it tends to hit them later on when they are getting toward the end of their fertility and would like kids but can't find a partner.
He has made some comparisons to radicalisation which often targets young men who have little or no hope of marriage or good jobs, and that if there are a lot of these people it can become a dangerous population. What he suggested which got a lot of press and outrage was that in order to minimise that societies had developed "enforced monogamy" which people though meant forced marriage. It actually just means a norm where there is only two people in a marriage, so that most people have a good chance of finding a spouse as opposed to systems where some people have many wives or for some other reason a lot of people never marry. But that wasn't reported much and I'm not sure hw many incel types would have caught on to that.