But we do have tools for recruiters to cross reference applicant names with the US census bureau's data to infer race and gender. We give recruiter bigger bonuses for diverse hires and we set specific % targets for them in their OKRs (basically quarterly goals. They don't get fired if they go under this, so I hesitate to call it a quota). That, and the aforementioned practices surrounding interviews and non traditional backgrounds.
Looking deeper at the documentation, I think the company maintains plausible deniability by giving recruiters discretionary authority over things like number of phone interviews and initial resume review coupled with hiring targets well above the industry average (current target for women is 33%). So the company does openly discriminate, but it gives recruiters the tools and discretion to discriminate as well as goals that essentially require discrimination to achieve - after that it's "see no evil, hear no evil, speak no evil".
My previous statements about non traditional backgrounds and 2nd phone interviews came from recruiters themselves. I can also confirm that, absent a referral, I've done 2nd phone screens for diverse candidates and have never interviewed a non-diverse candidate from a non-traditional background.