That's it, it's a slam dunk case Newsweek is liable for bajillions of dollars. He sure didn't act like a secretively paranoid inventor of bitcoin.
I bet newsweek would love to see his entire email history. He should probably sue them so he can see that email to the merchant and newsweek can read his entire email history, as well as subpoena various other people for their private emails with satoshi. This will be a winning legal strategy to protect his privacy.