While I actually don’t disagree with some of your points, “because they said they haven’t” is not actually proof that they haven’t. For example, the NSA has said for many years that they were not spying on US citizens in America.
And this is the first I’ve heard of this, as I missed it the first time around in June, so I’m glad to see it here. I never use iMessage (nor do I bother sending anything over the wires that I’d be overly concerned about somebody else reading), so it’s not a real concern to me, but it’s still interesting to me.