Realistically his opinions are held by a substantial amount of people that most would label conservative, although it's not mainstream conservatism for sure. And certainly not mainstream republicanism.
The point of Kaczynski is that both camps are mostly composed of middle-class Western academics living a sheltered life that are deciding who is socially accepted and who need to be cancelled. Our culture wars are not minorities shouting for a better life, our culture war is made of middle-class white people getting offended on behalf of minorities. They are no Martin Luther King, no Malcolm X, they just are posers that are making the racial (and gender and sexual) divide even worse than it is, by polarising or alienating the silent neutral majority.
This is a longer argument that's put more eloquently in the manifesto than I could ever write on a comment box.
Thank god there's a divide, otherwise I would be obliged to agree with you.
Genuinely amazed someone identifying with the Left would find these ideas interesting, and if so, they're going to love the deep philosophical musings on leftism offered by the likes of Tucker Carlson and Ron de Sanctis!