I understand exactly where you're coming from, and while most journal articles he provides are very specific in nature, there have been thousands of articles verifying classical conditioning. There are articles that link dopamine and pleasure and thus sexuality, and as far as that's concerned, porn does classically condition viewers into viewing more porn. The aspects of there being a link between porn and social anxiety, confidence etc. are still debatable, but the fact of the matter is that conditioning leads to addiction which is something completely unhealthy and something that no human being in their right mind would choose to have.
Regarding extreme anti-sexuality, he clearly states that he's not anti-masturbation nor anti-sexuality at all, and that's also the view that I have of it.
Regardless of if it has an effect or not, I have yet to hear a testimony of anyone who's stopped viewing porn for more than a few months that is dissatisfied with their choice.
Porn may well classically condition people to use more porn, in the same way masturbation in general classically conditions people to masturbate more often. But there's obviously other factors at play stopping most people watching 20 hours of porn a day and rubbing their penis raw. You can't say that watching porn -> reward circuits -> addiction any more than you can say having a wank -> reward circuits -> addiction or eating a yummy chocolate bar -> reward circuits -> addiction.
You admit the suggested links between porn and social anxiety are "debatable". Well, I'd argue that they're a damn sight more shaky than just "debatable", but even so your OP presents the following as facts:
(quitting porn leads to)
- No erectile dysfunction (note that viagra does not cure mentally caused ED!)
- You'll become more sociable and thus likeable - girls will notice this
- More confidence
If he's not anti-masturbation, surely you must question his entire stance re: the Coolidge effect? I mean, I see more attractive people in a day than my ancestors would have in a lifetime because I live in a very big city and travel about a lot, plus I see pictures of people on TV and in the cinema and on the internet. If he's suggesting that porn is the issue here, does he assume the Coolidge effect goes away if you're cracking one out over that hottie you saw on the bus? I hope he's not suggesting you should masturbate without thinking sexual thoughts/being sexually aroused, because I believe that's classed as compulsive masturbation and is in fact a bit dodgy.
In regards to your final point, you're likely the victim of a confirmation bias. Personally, when I've given up wanking/porn for a bit as a personal challenge, I find myself incredibly horny and thus more likely to do something sexually that I regret afterwards (e.g. fucking a stranger). The people who sing the praises of the anti-porn ideology are the ones who've already been sold on it, who are thus more likely to link every success following it with the anti-porn thing itself.