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I've seen him explain multiple times. It was a small point in the middle of a much longer conversation where he stated that societies that tilted towards monogamy were less violent and more stable than polgyamist societies. He was saying that said incel behaviour is abhorrent and that the solution is for them to become much better men if what they desire is to be sexually attractive and that this is easier to accomplish in a society where monogamy is normative. It's poor wording imo and would be slightly better served by 'culturally enforced', his example being if a friend who was in a relationship came to you and gleefully told you they'd had multiple affairs and not been caught you'd admonish them, even then 'enforced' has such strong connotations I don't think it's the best choice
He keeps weaselling out when pressured to explain exactly what he means, but as far as I can tell he thinks that sex is unevenly distributed and therefore when incels rape or kill people it's actually women's fault for not sleeping with them. He is also opposed to divorce and the contraceptive pill, stating that women who choose not to be mothers are contributing to declining birth rates in the West (literally echoing the white supremacist "great replacement" theory pushed by other alt-right nutjobs and that inspired the Christchurch shooter)
That's actually true, although the reality that he opposes a law making it illegal to maliciously misgender and deadname trans people is arguably even worse