“Memory hole” is a term that should be reserved for things everybody actually forgets. This is more of a thing lots of people probably remember, but they don’t bring it up all the time.
No, lots of people willingly stuck their heads in the sand and ignored the abuses that were happening. See Brigida v Buttigieg for a particularly egregious example around the hiring of ATC.
The FAA, on an official test that ATC candidates were required to take, would disqualify applicants if they didn't answer questions like "what was your worst subject in school" with answers like "math" or "science." This explicitly was to increase racial diversity, which is both patronizing in the extreme and really stupid.
When I bring this up in SF, people accuse me of making it up. It's not that people don't remember it, it's that political polarization has blinded us to our side doing batshit crazy things. Another similar example was "defund the police" which is a crazy slogan on its face, yet for a year Democrats felt compelled to sanewash it.
I am about as blue and pro-DEI as someone could reasonably be and I think that this stuff is small potatoes compared to a president who has been continuously trying to send the army in to crush Democratic-leaning cities. That being said, I'm pretty sympathetic to people who are suspicious of DEI because we do not have a good track record of auditing these programs.