I think it’s because they synthesized the voice and then called it George Carlin and sold it as a “New Comedy Special” it begins to fall into the category of Bootleg.

Except this is untrue. They were very open that this wasn't Carlin, but an ai learning from him and mimicking his style.

The better comparison is that to an Elvis impersonator who sings song they themselves wrote explicitly in the style of Elvis and try to sound like him.

I think ai changes the game and we need to rethink the laws, but I don't see this case lasting long in court, unless there is some law I don't know about.