all those transactions seem to have the same ways generate password/OP codes, too, so he would need to spend all of them at the same time.
If this is not a BS and is true....
He used used a custom method like: "Type 1 Deterministic Wallet" from here:
https://bitcointalk.org/index.php?topic=19137.0Masked with leading 000...0001 to set difficulty.
Bad news - if is Greg Maxwell creator of this puzzle password is 30 characters long and so complex that it will take you a couple of million years to crack.
