The OP should know about this, and tell his friend not to post anywhere else with his alt account other than in meta. If his friend ignored him, then it was clear that it was a ban evasion [if catch].
The ban has been already lifted.
There must be another reason why it's banned, but spamming is most likely.
The temporary ban was due to replying to an altcoin giveaway thread.
According to forum rules, it's not allowed to post an altcoin giveaway topic or reply to such a topic.