And even if he did write it and even if he did post it the so-called manifesto does not show him to be a right-wing white nationalist or a right-wing anything.
The one thing the Manifesto states is he was not doing this because of Trump and that the MSM will lie about that. And the MSM did exactly that. So this was a leftist since he also believed in Universal Income. So even lefties know the MSM is full of crap now.