Now with the winds changing directions under Trump administration 2.0, the same people are probably already denouncing their past and jumping onto the "DEI is bad" bandwagon.
Maybe hypocrites are pretty obvious to spot for you. It's not as easy for me. I was shocked to find many of my peers turn their noses at DEI policies and act as if they've always been against it.
Bandwagoners are going to bandwagon. I personally don't see much use in labelling them as anything else.
Why were you shocked? Are you new to the workforce? Did you never live through a time when criticising a company policy[1] was a serious CareerLimitingMove(tm)?
Throw in the fact that people were both routinely and publicly punished for not jumping on the DEI bandwagon, and you have a large number of people who would rather keep their head down and get their work done in the most agreeable manner rather than tell you what they think.
People aren't going to work to have their opinions validated, they're going to work to get money. They aren't going to jeopardise that money by going against the company vision (whatever that may be).
[1] DEI or otherwise. Don't worry though, when the pendulum swings back these people would then present as supportive of DEI.