It's clear that they know incriminating evidence or have had chats with such material in them. We're not like the sheep on HashTalk. You can't just waive an NDA in our face and we think that everything's ok. We're wolves, and we'll tear every last scammer involved in this to shreds if we have to.
And that may be the point. Possibly, not saying this but it is possible, they are simply giving a potential prosecutor a "raised hand" in a public forum in case an investigation starts... An NDA can be nullified by a judge very easily and would produce zero blow back while still allowing for the release of information.
This is somewhat incorrect. If they knew of it, they should have alerted the authorities immediately. Not doing so is aiding and abetting and they are liable for it.