Maybe he loves Ethereum so much and dreamed to become a dev for once.

Actually, I'm also surprised before that he has a better name than I.

But when I saw he's postings, it looks he is not an Ethereum Dev rather a fan of Ethereum I guess.
Forbidden name is good to avoid misleading the community. For example: if there is someone who registered with Satoshi Nakamoto's username but just a fake one. It could mislead the simple minded members. Anyway, I wish the real one will enter the forum.
I guess it is not the major case need to resolve. If I'm not mistaken, username can be change. Therefore, the admin can DM them to change the username just to respect the real person's identity.
If the admin accept this suggestion, another work need to be done.