@Marlin From artist request:
Do not use this tag if there is a source available, such as the artist's homepage, blog, Pixiv, etc. Read howto:pixiv and create a new artist tag yourself, or ask for help in topic #8199: Artist tagging help.

Create artist tags whenever you cannot locate one rather than leaving it for someone else to do. You can learn more at howto:artist.

chinatsu said:

@Marlin From artist request:
Do not use this tag if there is a source available, such as the artist's homepage, blog, Pixiv, etc. Read howto:pixiv and create a new artist tag yourself, or ask for help in topic #8199: Artist tagging help.

Create artist tags whenever you cannot locate one rather than leaving it for someone else to do. You can learn more at howto:artist.

No need, this artist was already on wiki, but not with this twitter account. Poor research and my mistake, I guess.