Security is as important as life for a Bitcoiner. I think a person who is careless with the security of his forum account may also be careless with his keys.
Note: Lauda cannot return to the forum, even an imposter cannot use the account. The account was banned and the signed message was invalidated.
Lauda wasn't banned. He left the forum on his accord and said he was never coming back. I think the account was locked at his request, because from what I read he asked the community to tag any account bearing similar username, or if his account ever became active again.