Waiting,
His statement is not exclusionary it is general. That being the case, reporting these matters to the legal authorities should be sufficient until they have reached a decision. At that point assuming they find the accused guilty then reporting that fact to members of the congregation would certainly not be slander. Speaking to members of the congregation who are not involved investigatively or judicially before there is some resolution does not seem like a good idea. As someone pointed out, and I have seen this happen, these accusations are not always correct. In that case character assassination is what's happening, less serious than molestation perhaps but equally capable of ruining someone's whole life. If that sequence is followed, report to authorities on accusation and then speak to people once the authorities have resolved the matter, then there is no protection of the guilty party by any 'code of silence.'
I very much regret your personal experience, what happened was wrong. I am much relieved that anything like that today is at least supposed to be handled differently. I would like to see this man's letter published just to continue the process of educating people in the organization.