Having not flown a Pitts, I would presume this would be for the uncertified version, as the certified version would have had to demonstrate being recovered from a one turn spin, in one additional turn to be certified at all....
Maybe I wasn't very clear. That's from a deliberately flattened spin, using the prop to pick the nose up at the entry and then holding it there with power. I don't know what "abused control usage" means exactly, but you'd really have to be working at it to get there by accident.
From a normal spin - neither flattened nor accelerated - as I said it recovers in about a quarter turn.
The Pitts is truly delightful to fly. Unfortunately though at the end of every flight you have to land it, which is a different story. (Well, you don't HAVE to, but it really pushes the insurance up if you don't).