Hm. Previous chapters were by Katyusha. Looking at their group page, the description states: "No works under this name will be uploaded on mangadex as long as rule 2.4 is in place."
Rule 2.4 is the "inactive group" rule. "A group that is locked, has missing chapters, and has had no new releases on MangaDex or any websites affiliated with that group for a period of 6 months is eligible by the request of any user to become marked as inactive."
So... Was this group flagged inactive and that description is because of it? Or was the person behind that group (
@A I think) upset at rule 2.4? Baka-updates states that Katyusha is a dead group.
Edit: Looking at Mitsuboshi Colors, the most recent translation by that defunct group, it's the latter. They're angry at rule 2.4 for some reason.