The user has been in contact with me via PM's as I gave him negative trust after I saw the spam posts. I have reasons to believe this is now the original user speaking from this account, however he has no publicly known Bitcoin address on the forums and he doesn't have a way to sign a message from the altcoin addresses he has on his post history.
Internet Wayback Machine has a
snapshot of his profile, with a blog
linked. As you can see the user has now posted there indicating that he probably has control of his account again. Also, on his Trust page, he has untrusted positive feedback for discovering and accusing hackers.
Therefore, I think I will remove my negative feedback from this user when all spam posts are deleted.