I'm glad they're speaking out. A shame slander/libel laws don't apply to organizations, though I suppose it's best they don't.
I'm pretty sure it is only government who cannot sue for libel. I don't know how it would work when there is the disclaimer saying it is a work of fiction and yada yada yada. Obviously the defense couldn't try the truth defense, and with the work of fiction disclaimer they are admitting knowledge of falsity.
I'm glad they're speaking out, too. High time and then some.