I think the core argument around feminism being a contributor to “western ruin” is the idea that it continued to socialist policies that while on the surface sound great create a less meritocratic environment leading to the nanny state and redistribution policies that ultimately lead to more taxation , larger govt and so on. Oversupplied, broad idea. Not saying that this is how he interprets it, just how I understand that point of view. Also the destruction of the family unit, the bedrock of strong societies.