If pg gave "details as to why, what they could do in the future to prevent this or any kind of statistics or advice" he would be giving advice on how to get around the voting ring detection. I imagine he probably does not want to help people evade the process he worked to put in place to cut down on spammy/fraudulent submissions.
In this case it points to a flaw in the system itself - if having any details of it at all allows you to game it, it only takes one lucky person to stumble across some aspect of it accidentally and we will have multiple unknown exploiters using it.
In the case it was absolutely, imperatively impossible to give no details whatsoever, then stating this would probably have been helpful.
