Cover art have already been uploaded: Release “ノクトメモリア” by ABSOLUTE CASTAWAY - Cover art - MusicBrainz (especially the “back” one) - I didn’t read the packaging carefully enough when uploading, and only realized that I screwed up today.
The justification for the re-assigning the artist was raised by @FichteFoll and @tojikomori
Relevant discussion: How should we handle doujin music? - #32 by lateinautumn
Relevant discussion 2 (cancelled edit): Edit #79041755 - MusicBrainz
Update: looks like another editor familiar with doujin music has approved the change.