Intuitively it feels logical that this would be challenged, but what do I know about copyright law. Surely cloning a famous artist's voice and musical style to piggyback off of their popularity would be some kind of infringement? And it's not like you can pretend to be loosely "inspired" by them or so, you're definitely intentionally faking their singing and voice.
Beyond this specific occurrence here, I think impersonating someone else's voice or appearance should generally be forbidden, except for say satirical use cases of course (which should come with some disclaimer).
Claiming intent hardly seems fair when it was advertised as being an AI impersonation, no? If they intended to deceive then surely they would have claimed it wasn't AI.
Beyond this specific occurrence here, I think impersonating someone else's voice or appearance should generally be forbidden, except for say satirical use cases of course (which should come with some disclaimer).