Okay, and? Being a YouTuber does not exempt people from getting banned.
If a user wanted to be unblocked on a wiki, they can contact the blocking admin here at Community Central.
It's not about a blocked user, it's about an autoblocked IP. If the original blocked user is not you, you can contact Fandom staff (Special:Contact) and see if they can help. But as a good advice, never lie to them.
Well, for autoblocked IP, a user (assuming they aren't a sock of the blocked user) can still contact local admin about the autoblocked IP and the admin should be able to remove autoblocks by going to the Special:BlockList and unblock the autoblocked ID. The block length of autoblock is 24 hours.
I've issued blocks in wikis in the past, and I knew that it lasts exactly 24 hours by viewing the BlockList. Also, if you view this section, they mentioned that autoblocks only last for 24 hours.
Also, it looks like the user the OP is talking about was indeed to target of the block. The error message says so.