I think it's a mistranslation. They said music producer [company] when they meant record label.
Oh, yeah. I forgot the music producers are not paid by DSP, and they are usually paid by the artists' share (usually in the western industry). Usually 15-20% out of the artists share.
But in the Kpop companies case, typically companies sign their own in-house producers and have their own contract- kinda like the artists. So, at the end it's just the idols % or share.