when these groups succeeded.
That language seems to presuppose that whatever change they achieved has now stopped. As I said above, I think that's very far from clear.
the closing of the gender gap appears to have stopped
That post seems long on anecdote and short on data.
Pages 10-11 of this document seems to show a steady decline in full-time gender pay gap from 1970 to 2010. The part-time figures are weirdly different; by eye they seem to show one downward jump circa 1974, then approximate stasis, then another downward jump circa 2005.
I remember seeing a talk of the concept of privilege show up in the discussion thread on contrarian views.
Some discussion got started from "Feminism is a good thing. Privilege is real."
This is an article that presents some of those ideas in a way that might be approachable for LW.
http://curt-rice.com/quotas-microaggression-and-meritocracy/
One of the ideas I take out of this is that these issues can be examined as the result of unconscious cognitive bias. IE sexism isn't the result of any conscious thought, but can be the result as a failure mode where we don't rationality correctly in these social situations.
Of course a broad view of these issues exist, and many people have different ways of looking at these issues, but I think it would be good to focus on the case presented in this article rather than your other associations.