When Harris had to pick a VP, all media kinda agreed it should be a white male, to balance the fact that she is black and a woman. So Walz is the DEI hire.
If you ask me, I'm upset no one picked up that this consideration was sexist and racist, although it is indeed the best choice for her to win, which reflects how bad US can't get over race and gender.
Vance is also a DEI hire. They didn't want two geriatrics on the ticket so they chose someone young. Diversity in age. DEI can be spun many ways. It's not a bad thing.