I've heard the name satoshi has been banned on this forum, but I can't remember where I read it. This is one of the good stipulations to not let random users use the satoshi name when registering and make a mess.
You heard or read correctly, Satoshi's official account on this forum is locked for security reasons, so even if Satoshi ever returns and wants to prove their true identity on the forum, they aren't going to immediately do so by posting from their official account on the forum, they will first of all have to prove themselves to Theymos, in order for him to unlock the account, and there's only one way they are going to do that:
His account is locked, so no. If he wants to claim his account, he'll have to contact me with a PGP signature.