You dismiss some well-known and accepted speakers.
Well known and accepted by whom? Certainly not philosophers in Peterson’s case. I haven’t read his work in psychology and I’m sure it’s great. But he knows next to nothing about Marx or the post-modernists.
As I’ve stated, ‘cultural Marxism’ is a conspiracy theory. If you want to talk about the Frankfurt School, we could have a discussion about that.
With regard to post-modernism, which philosopher are you interested in? Really the only broad point that can be made of ‘post-modernism’ as a philosophical tradition is that it turned a skeptical eye to the grand dogmas of the past and systematically critiqued them. Beyond that there’s a huge variance among individual philosophers.