They're describing the "music" that's churned out almost entirely hands off to siphon royalties. Even the creator isn't listening to 100% of what they're uploading, it's spam that can be produced in massive quantities and can overwhelm a platform if left unchecked (as the article describes, AI music is 1-3% of actual listens by users but 44% of uploads).
Actual artists who need years to create a few hours of handcrafted content don't have a chance in an environment where hundreds of hours of slop can be generated in less than a day for a few hundred bucks. Platforms like Deezer recognize they need to address that imbalance somehow or they'll eventually lose their high quality contributors in a vicious cycle if it becomes impossible to compete.