Yes, especially if he's been accused of being Satoshi previously and doesn't want the world to know that. What better way for the real Satoshi to throw people off his trail than to claim to be Satoshi and offer up proof that you know will eventually be debunked?

If your goal is to eventually start spending the large quantity of initially-mined Bitcoins, it seems like the first step would be to ensure that they're never traced back to you, especially if you don't want to pay taxes on the proceeds. And getting crossed off the list of potential Satoshis is a good first step.