Only Editors can add unavailable uploads currently. I think we're eventually going to create some sort of megathread to facilitate such requests and direct people there when they're made.
original (unavailable)
https://www.nicovideo.jp/watch/sm6287941
data
https://web.archive.org/web/20210228033956/https://www.nicovideo.jp/watch/sm6287941
Did [[PinocchioP]] really contributed themselves to the works tagged with this creator tag, rather than just being an author of the song? It can be [an author song attribute tag](https://otodb.net/song_attribute/%E3%83%94%E3%83%8E%E3%82%AD%E3%82%AA%E3%83%94%E3%83%BC) for the latter case.
Fixed now. Revision history display will be improved soon to make spotting cases like this easier. Rollbacks will be fixed as needed to be made more robust to handle these situations better as well.
@kojitadokoro seems to be vandalizing anything related to [[k0lc]] tag, I see r82795 and r82800 attempting to rollback their changes, but even more tags are now missing.