Your framing makes it seem like earlier feminists realized their errs and opened up

I really don’t know where you got that impression. I specifically talk about feminism, so that the focus is on an intergenerational time-frame.

My point is that it’s the achievement of intersectionalism, not of feminism

I am not familiar with the term intersectionalism. I know that intersectionality started as a term for legal analysis coined by Kimberlé Crenshaw and then was adopted by feminists because it created a helpful analytical framework.