You don't think his email alone would be enough to at least bump the price? I bet if you sent emails to a few select journalists from an account known to belong to Satoshi, implying that you will begin offloading coins, you could easily cause the price to drop. I'm sure there are other ways too. Even if they thought to authenticate his identity, which many wouldn't, they would still write something up about it, and the speculation alone would have an effect.