All of the above is nonsense, accounts dont get deleted. Signed message or not does not matter.
~Snipped~Accounts don't get deleted, as Shorena said.
accounts cannot be deleted. ~Snipped~
Finally found it ... Apparently they deleted for someone in the past and I also see another guy with a thread that his account is no longer clickable although the thread he made is still there, not sure what their reasons were
Link:
https://bitcointalk.org/index.php?topic=43648.0