They have to break the law to be sued for slander or anything of the likes, yes. That's how the law works. You need to break it to get in trouble for breaking it.
Credentials pulled? Hardly. Apple isn't going to send them test units any more or invite them to events. That's well within Apples rights and they don't have to do anything at all for Apple to do that. It was a privilege that was taken away from them.
It doesn't matter anyway the majority of tech reviewers buy there own devices and that's what this media outlet will do.
I agree with all of that. I also agree with Apple's action in this case. It's time to send a message that the rediculous intentional bending needs to stop. I see no reason for Apple to indulge media outlets that engage in this activity. At this point there's absolutely nothing to be gained on the consumer end from yet another clueless "journalist" grabbing an iPhone and cranking it out of shape.