"We'd like a more diverse pool of applicants" does not mean "we'd like a pool of applicants with zero of <over-represented demographic> in it".

It doesn't even mean they want less of that demographic at all. It can (and likely should) be read as wanting a larger applicant pool overall, adding in folks from demographics who simply aren't applying currently.

Nevertheless, if the demographic profile of their hires doesn't correspond to the demographics of the population they're embedded in, it's reasonable to question whether 1) they're unfairly excluding people and 2) the extent to which the people they're excluding could have contributed.