They approached Johansson and she said no. They found another voice actor who sounds slightly similar and paid her instead.
The movie industry does this all the time.
Johansson is probably suing them so they're forced to remove the Sky voice while the lawsuit is happening.
Nothing here is shitty.
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.