Unlikely. An admin could simply access anything they wanted by looking at the forum's unencrypted DB. The password was reset via email, so it was probably not the hacked password that was used, although email addresses were leaked, so it is possible that someone hacked his email address and used that to reset Hal's password.

IMO, it is more likely that one of his heirs had reset his password, and I do not see any reason why his heirs should not have access to his account/information available when accessing his account.