It says January 25, 2021 9:47 PM on his (maybe?) secondary accounts at https://www.pixiv.net/en/users/64343988. Although there was same gallery containing the same artworks, but it was with different pixiv account https://www.pixiv.net/en/users/4173203, so... confirmed his 2nd accounts? Because the fact is that he's deleting this artworks, but re-uploaded on his 2nd pixiv accounts