> Early porn exposure goes hand in hand with the problems we see typified in the recent Netflix movie Adolescence

There's really no evidence of this. I find it much more plausible that the boom in misogynistic radicalism is caused by the flourishing of radically far-right niche content online. Our society has become more politically extreme in a number of ways over the past couple decades, and there's no porn equivalent for anti-immigrant or anti-trans sentiment. Andrew Tate, however, is very much of a kind with figures like Nick Fuentes and Alex Jones.

That's not to say porn viewership doesn't have an effect on kids, but I expect it would be much more modest. Unrealistic ideas about sex, anxieties about penis size. I'm in my mid-20s; internet porn was highly accessible to me & my peers when we were young, and while it did have an effect on youth culture, it was quite modest—nothing like the hard pivot to misogyny which I've heard teachers describe when their students become interested in (again) Andrew Tate.