zuburoku tag

There is an artist tagged zuburoku here, but I have seen him tagged by another name celis.

Which would be the preferred artist tag?

Zuburoku said in his pixiv profile page: "I used to draw illustrations for Celis' website titled 'Boys and Milfs(少年と熟女)’, using my old nickname, Daisansha (第三者).”

So celis is the name of a site, not even a name of the artist...thank you.