What you're describing is not how it works. Chiefly, the hiring pipelines are not set up for a single role, but a whole family of them. They are filled ahead of need. (Or were, at a time when this would've been taking place.)
There are other inaccuracies, but suffice it to say, this comment section is full of comments by people who have never been hiring managers talking about how hiring works.
I re-read the wiki page on the DSA multiple times. It does explicitly spell out that at least one "diverse" candidate must be on the slate for each role. Yes, candidates are considered for multiple roles as they go through the hiring pipeline, but that doesn't change the fact that it prohibits moving forward with a hire if the candidate pool for the role does not include a diverse candidate.
If this is wrong, but all means explain how the DSA actually works.
There are other inaccuracies, but suffice it to say, this comment section is full of comments by people who have never been hiring managers talking about how hiring works.