I did around 1000 interviews for my current company and about 200 for the previous one. I found that in IT in Europe there are not many candidates to meet DEI targetsand still hire the qualified ones. Even expanding to other continents, we barely made it; the last team I hired was one Latino, one Filipino and one white, 2 out of 3 were male. I interviewed around 30 candidates for these positions and I selected the top 3. These 3 were just above the lower limit of expertise to be hired, so I basically had zero choice, the alternative was to pull triple shifts myself to cover for the missing people.
Let's say you are the director of a steel plant. DEI targets are totally irrelevant, I never heard about a woman working on the plant floor, but I have many cousins who did. Dying at 45 or 50 years old due to lung or throat cancer is not something many women want to, but all my cousins did. I don't believe in DEI in these circumstances. But if you want DEI in "a day in life of a Microsoft /Twitter employee having free food and pointless meetings all day" videos, that is not fair.
So, I don't know why you were not able to place the developers, but think about DEI even more. We have several black people in my department, one of the best PMs I worked with is an older black woman, a good professional will find a place almost anywhere. Morgan Freeman shows that being black does not prevent one from magnificent results, but asking for rewards for being black is not the way.