Earlier quoted context omitted.
The reality is that 2,000 of them are indistinguishably good and diversity programs are intended to make sure that google hires equally able women out of that group instead of choosing all the men.
Imagine a theoretical scenario where they have 500 female applicants and 9,500 male applicants, but desperately want a 50/50 workforce. Then they logically would hire all female applicants, including those who are not part of the 2000 most capable applicants. Using your number, with 2k out of 10k applications being indistinguishable elite, that means 1 in 5 applicants are suitable to be hired on merit. Assuming that…
1: Even if there are a 1000 positions, and only 1000 candidates, if they are underqualified, they do not get hired. Google, Amazon, Facebook, etc, try to have an objective bar, not one relative to the available candidates.
2: Nobody is pressuring for a 50/50 workforce. It's an ideal, and a reasonable-sounding long term goal, but even the most aggressive pro-diversity initiatives do not set a target of 50/50 ratio. In fact, in most cases HIRE targets aren't set at all. The targets are set for opportunities - ie number of diversity candidates evaluated or interviewed. The hiring process remains pure.
Source: Work for major top-10 tech company and do a ton of hiring, and diversity training.