I'm sure the "elite overproduction" model is mostly wrong. But I also think it is an interesting/useful way to look at some things happening in society recently.
Certainly, you can think of the recent "cancel culture" phenomena as a great way to remove elites to make room for new ones. (Maybe you could argue that some of the effects of MeToo were similar.)
DEI -- along with hiring quotas -- tended to bring new "officials" at companies and government orgs ("head of diversity") which is another great way of "creating" more elites.
Kinda neat, I think. But probably not super-explanatory.