There may be a lot of webmasters and SEO's starting fresh from Penguin from what this is stating, and it is from Matt Cutts, so I would consider it good info.
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If you've cleaned and still don't recover, ultimately, you might need to start all over with a fresh site, Cutts said.
Yes, that is scary for someone who was hit, is trying to frantically make changes but has not seen any recovery. Now, if you have not seen a recovery yet - I wouldn't worry, I don't think they refreshed the update yet, so there wouldn't be any recoveries in my opinion.
But Google is not going to roll this back. Google's Matt Cutts said, "It's been a success from our standpoint." Were there false positives? Few Cutts said, "we've seen a few cases where we might want to investigate more, but this change hasn't had the same impact as Panda or Florida." Very interesting.
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