Earlier quoted context omitted.
DEI is nominally about adjusting the situation so that the end result is equal. For example, paying women equally even if they don't negotiate as aggressively as men. The nominal case doesn't always match the reality, but the reality is that no one has a level playing field to begin with.
The whole thing is about trying to eliminate sources of bias that we can. For example, blind screening of resumes where names and similar personal info aren’t given is a way to avoid racial bias while focusing on what matters. People have pre-determined opinions about many things, even if it’s subconscious. That’s an example of DEI policies trying to level the playing field to avoid unfair discrimination.
In theory if DEI was about being race, sex, gender, sexuality, age blind, it wouldn't be controversial.
But companies went in hard with things such as quotas, and there's even cases in the courts at the moment where Red Hat/IBM supposedly awarded bonuses based on hiring managers fulfilling diversity quotas.