All you know is that somebody being sued for multi-millions of dollars (and who's trustworthiness is pretty much shot) is claiming what they did. And frankly given the frequency and ease of voice cloning, there are very few people who can say with confidence that they know 100% that nobody at the company did anything to that effect.
What employee, if any, could say with 100% confidence that this model was trained with 100% samples from the voice actress they alledge and 0% from samples from Scarlett Johansson/her? And if that employee had done so, would they rat out their employer and lose their job over it?
There's no doubt a very small (but finite) probability that the voice sounds like a grey alien from Zeta Reticuli.
That doesn't mean the alien is gonna win in court.
Anybody on this forum who says that it's entirely impossible or that it's conclusive that they didn't use her voice samples simply isn't being logical about the evidence.
TBH I really like the voice and the product, but I'm having a lot of trouble wrapping my head around the number of people who seem rather tribal about all this.