Earlier quoted context omitted.
If your organization's demographics don't match the demographics of the broader population of qualified candidates, there's a good chance it's because you're biased (intentionally or not) in your recruiting or evaluation. In that sense, "focusing on the pool of applicants and making sure everyone gets a fair shake" are pretty much exactly what diversity efforts are about.
By their wording, it seems like they're more focused on the outcome of the hiring process. No black managers is the outcome, and they said that's unacceptable. If you look at the process instead of the outcome, it might not be the same. If the scenario was that no qualified black people applied for management positions which resulted in not having any black managers they could still come back to the public and say "W…
To take your example, if the scenario was that no qualified person from a given group applied, you can look at your process and ask what prevented them from doing so. Maybe there's a perception that your organization is hostile to that group, and you can do something to address that perception. Maybe your job postings are only going up in places that target a specific type. Maybe your 3rd-party recruiters are biased. Whatever the reason is, if the broader population of qualified candidates includes groups that aren't applying to your organization, that's pointing to a process problem you can try to fix (which I very much think of as accepting responsibility for my own actions).