I think what happen is that the guy got access to his wallet, and changed the password. But now he is reindexing the whole blockchain and it will take a month (slow connection/computer) until he can move the funds.
This is what I understand from his messages.
He is, as stated above, a scammer.
Re-indexing has nothing to do with your ability to
1) Move coins. Since once you have a password you can export the private key and import it into something like electrum.
2) Sign a message.
-Dave