Also, they proceeded to ask her for rights just 2 days before they demoed the Sky voice. It would be pretty coincidental that they actually didn't use her voice for the training at all if they were still trying to get a sign off from her.
From technical standpoint, a finetuned voice model can be built from just few minutes of data and GPU time on top of an existing voice model, almost like how artists LoRAs are built for images. So it is entirely within possibility that that had happened.
This strongly suggests they weren't trying to get her voice until the last minute (would have been too late for the launch) but, rather, they had already used the other actress, and realized they were exposing themselves to a lawsuit due to how similar they were.
It was a CYA move, it failed, and now their ass is uncovered.
Like, lets be real here. This wouldn't be the first time they would be using material without the right to them and I don't expect this to change any time soon without a major overhaul of EVERYTHING IN THE COMPANY and even then it will probably only happen after lawsuits and fines.