I think it's just the usual CSW fear-spreading ego-bullshit. Anyway, there's only two weeks left to prove his claim, after which he sinks deeper into the hole he's in.

Edit: From his website: "Creator of Bitcoin – Satoshi Nakamoto. Eternal student & researcher. nChain Chief Scientist. Lawyer, banker, economist, pastor (), coder, investor, mathematician, stats & world curious. My opinions are my own."