They disclose as soon as they're permitted to, but the trouble with that is that the permission is coming from the people who are the problem in the first place.
An approach that would care about customers and show some more guts would be simple refusal. In essence, civil disobedience in the face of someone who is violating the law. Let the government take them to court, and let it be disclosed in that way.
Before we applaud them too much, keep in mind they're also telegraphing that this behavior is continuing. It doesn't take much skill to read between the lines and see that this is an ongoing problem for them, there's just a lot more of it that's happened that they're not allowed to disclose yet.