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.