I guess I phrased that a bit poorly. He still uses the Cornelius name for the album as a whole. I meant he's using his real name for individual track credits. It isn't too unusual for an artist to release something under an alias but use their real name for credits. That's what's happening here.
You can see this on JASRAC for example - 作曲：小山田圭吾 / アーティスト：コーネリアス
I don't think VGMdb has a way of dealing with this type of thing which is why I have "Keigo Oyamada (a.k.a. CORNELIUS)" in the notes instead of just "Keigo Oyamada".
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