question about reason of rejection

[komihs]

Apologies for my poor English

I recently submitted about this album( https://columbia.jp/artist-info/sora...OZX-247-8.html ), and the submission had been rejected.

This is a album of sorachoco, a unit that consists of two voice actresses.
And composers of this, Keiichi Okabe, Satoru Kosaki, cota, Fumikazu Takenaka, are mainly compose Anime or Game music.

For the reasons above, I figured that this belong to the category of music from Anime or video game.
Music sung by voice actors/actresses and isn’t animation theme song/insert song isn’t eligible for inclusion on VGMdb?