Hehe. It's only defamation and libel if it's demonstrably untrue.
Imagine if this was "dontdateher.com" and he was calling his former date an STD infected, bitch, who was little more than a gold digging prostitute?
The women would be going nuts over him calling her that no matter how true it was.
Look at what hollyweird is pushing as the next comedy "the exgirlfried is a superhero" with her doing the PMS breakup attacks.
Not only do I hope he wins and sends a message, I hope the judge imposes PUNATIVE damages and PERSONAL liability upon the founders and ex girlfriend.