These things won't replace rock stars, they will (or at least want to) replace the vast majority of the industry which is tv shows, movies, ads, etc, which the disclaimer as the end alludes to.
The thing I notice time and again in all this is they want you to believe technology is displacing labor at one end but there's usually a lot of retraining consumers/society to accept something qualitatively different to cover up or re-conceive what was. That's not a moral judgement, just an observation. But the end result is usually the same, some group of current or wannabe oligarchs playing musical chairs at the top without regard for the rest of the system.
It's a terrible thing.