When Apple speaks about “blocking techniques that exploit fake credentials in order to gain access to iMessage,” it is talking about the way Beeper Mini connects to iMessage using Apple’s push notification service. Beeper Mini intercepts this push notification and sends it to your device. Apple’s servers have to be convinced that they are pinging the notifications from an Apple device. Perhaps a Jedi mind trick is employed. (“These are not the Droid devices pretending to be iOS that you’re looking for.”)
Beeper says that no one can read messages sent to you keeping your privacy intact although this cannot be verified by Apple and the company is concerned about your privacy and the privacy of those you are chatting with. When Beeper and others like Sunbird sent your iMessages through the aforementioned Mac, there is no security protecting your messages. But with the notification protocols being used, Apple felt that it needed to cut off Beeper Mini.
But just because something makes sense to Migicovsky doesn’t mean that it makes sense to Apple. “What we’ve built is good for the world. It’s something we can almost all agree should exist.” But Apple doesn’t see it that way and the tech giant will continue to do whatever it can to keep iMessage under its own control.