Not a fan of this quote really. It seems to be built on the premise that humans are somehow incapable of sincerely believing in nonsense because, I don't know, we're just inherently rational or something?

I think it's just observing a sort of nihilistic troll behavior that's probably a thing that some people have always done, where the contents of what's being said doesn't matter so long as they're at once inflammatory and self-serving. It shouldn't be taken to conclude that everyone who is awful is just maliciously pretending, but that there's a certain sort of bombastic troll who just makes up shit on the spot and says it with a shit eating grin and complete conviction, knowing that it's bullshit but enjoying the harm it causes and the way it furthers their own goals.

It's like a less formalized, more intuitive version of neoreactionary meme magic bullshit, just saying things you just made up over and over until people believe them.