But isn't it the case that people who do blame everything on "whiteness" have a tendency to call their view "Critical Race Theory", and isn't it also the case that this view is prevalent enough that this actually ends up proposed as a way to teach things in schools?

I don't think Nathan is arguing against a straw man here; if he's not using the term CRT the way it was originally conceived, isn't it because he's arguing against others who use it that way?