No, no law against saying something if its true, generally speaking. And its not libel or slander if its true and the allegedly libelled person is a public person or entity - such as a business. They put themselves out there in the public "view" and therefore are subject to unflattering things being said about them. A lawsuit like this clown filed is exactly the same as a restaurant filing suit over a bad review. It's been a couple of years since my torts and ethics classes, but it sure seems to me that
A) if anyone would have had the spine to actually fight it out, the suit would have been defeated. The guy who forked over money for allegedly hacking into the clown's website doesn't count - that's an entirely different issue.
B) If a lawyer would have filed this suit that had any of the same professors I did, they would have tracked him down and kicked his butt for filing a frivolous suit. Filing frivolous suits, such as ones that go against basic rules of law, is (depending on where you are) subject to disciplinary action and (depending on where you are) can get you on the hook for the defendant's legal expenses.