Either the story is bogus, and Acorn has a pretty rock solid slander case, or the story has merit, and they DON'T have a rock solid slander case. And since no gag order has been served, or no other legal action taken, seeing as this story is still on their site...I'm gonna go with, there has to be a least a decent shred of truth to this story.
A car dealership got sued for accusing a rival of having links to terrorists. And I believe the settlement was quite a decent amount of money. For some car dealership out in bum fickle egypt, that NO ONE has heard of.
Acorn, on the other hand, and Fox News....are, well.....national, and most EVERYONE has heard of both of them. If a slander suet made the news for some unknown car dealership, I have to imagine that the other would be front page, at least a full 5 inches of text, with a nice big photo.