Oh, I'm quite sure it wasn't public. I had an OkCupid profile at one time (thankfully deleted, and even then it had no identifying details and was linked to a dummy email), and the only reason I agreed to sign up was the site's assurance that absolutely NOTHING was publicly visible unless you had a profile.
So, yeah, at the risk of breaking my attempted objectivity, I'd be personally thrilled if the guy got sued.