>From my experience, the bulk of discrimination occurs before hiring event starts - recruiters extend phone interviews to diverse candidates at higher rates.

How is this different from any other targeted recruiting? FAANG recruits students from CMU while not even visiting my alma mater. Recruiters extend phone interviews to referrals at 100% rate no matter how bad they suck, etc. Diversity recruiting != diversity hiring, and the numbers bare that out. Unless you argue that recruiters should have zero targeted pipelines I'm not sure how it's unique for diversity initiatives