You really need to read it yourself, because your claims are totally inaccurate. Just off the top of my head, I can name several friends he had after he was 14 were James, Addison Altendorf, Philip, some French guy named Max, an adult friend named Rob Lemelson. You need to read this before commenting on it.
He said in his last video he was friendless from age 14. Since that reflects more poorly on him, and he’s such a narcissist, I’m inclined to believe the video on that point. Why lie about it?
You should watch the videos as well as read the manifesto.