That this seems so strange to me now worries me.
But I will say -- there's this whole information ecosystem out there that these guys are bathing in every day, and we need to stop ignoring it like it's some fanboy group instead of a terrorist mentality.
It is being facilitated by the platforms that refuse to act.
Also, let's stop calling it a manifesto. It isn't. It's self-FAQ of musings while he read things in chatrooms. There's no cohesion or narrative beyond he wants to be remembered for being more than garbage.