I think the article makes a mistake with its use of the word "diversity" here since these days the common use its ingrained more as a matter of race/gender and

I think the article makes a mistake with its use of the word "diversity" here since these days the common use its ingrained more as a matter of race/gender and not so much opinions, and really you can find plenty of groups with that idea of diversity where everyone thinks the same and there's no debate whatsoever. The word OP is looking for is groupthink, and the problem he's describing starts with deindividuation, the process when the group cohesiveness takes priority over individual freedom of expression. And well the problem with this "mirrortocracy" (which is just a new word to describe Nepotism) is the typical conundrum of " I want either less corruption or more opportunity to participate in it", basically the problem wont be solved until the number of people trying to enter the inner circle becomes smaller than the number of people trying to tear it down. But the reward for those who do make it is so high most individuals would rather live in what's essentially a tragedy of the commons than a place where there is more equality at the expense of a much lower chance of "making it big".