I am, however, a white male who checks most of the 'tech dude' boxes, and I don't usually have to guess what people are thinking about this. I just have to be around at the right time for people to make their opinions known. So my evidence is anecdotal, but no, I don't have to wonder if people have racial bias, they will tell you if you let them. I have also observed a manager who's religion made women subservient, and no woman he ever managed was promoted. Bias or just probability? One of those women is now a very successful director of engineering. (She left his team and was promoted elsewhere)
While I can't speak to all DEI programs, the intent at most places I've been is to interview a wider range of people. That might show slight favor to interviewing, but the bar for hiring does not change. This is not just a problem in tech, the relatively recent NFL head coach issue of teams deciding to hire a coach and then interviewing a black coach after that "for compliance" with no intent of actually considering them is a huge problem.
If you work at a place that truly only hires people to check a box and doesn't care about that person's success or the impact around them, sure, move on.