Suno 3.5 – Chasing the Green Flame

Coming to a strange part of copyright. This song was written by Suno 3.5. I took the singing from the rendering Suno did, and replaced all the other instruments to make it clearer-sounding (Though I admit Suno did a better job mixing).
Now I’ve done a partial cover of a song that no one wrote.

How does this work legally?
Do I need to credit the “no one” as the composer?