It is true that the Biden and Obama FAA prioritized DEI over safety. Whether DEI is directly responsible for this crash, we can’t know yet.
I personally don't see it as being directly responsible for the Reagan, Potomac River crash itself but the extreme efforts going all the way back to Obama to bring DEI into the mix when it came to hiring ATC's certainly appears to have had a direct effect on the shortage of Controllers and in some cases, their overall competence... If you lower the standards you get an unsurprising result...
There's an Aviation Lawyer who has been on Fox and Newsmax recently who has made some eye opening and extremely concerning (if true) statements about DEI and the hiring, training and retention of ATCs... His name is Micheal Pearson (he's also a former ATC)..,
Here's the clip from Newsmax (the FOX one was clearer but I can't find it...):
Now I disagree with him about the helicopter pilot in this case not having "any" responsibility for the crash but what he has to say about the long term effects of DEI and the ATC's going back to Obama is both interesting and concerning...