This story is blowing so fucking far out of proportion it's honestly incredible. Just so everyone is one the same page, here is a video timestamped to the voice, and immediately following the voice you can hear the voice from Her as well.
They are not similar other than they are both female.
The whole "her" thing that Altman threw up on twitter is just because the goddamned movie was a touchstone for the kind of thing that they are doing. They weren't cloning the fucking voice. It's like naming your new iguana Godzilla. It's not going to destroy Tokyo any time soon, it's just a cultural reference, you know, like a meme.
As far as Johansson goes, she is falling prey to this shit just like every other celebrity that has been railing against big bad AI. There are so many sheisty lawyers trying to get their hands on the first big win from an AI suit that they will say anything to get a celebrity to sue, because if their firm wins, they become the Anti-AI lawfirm that all others will seek in the future. They will print money, but only if something sticks, and so far, nothing has. This will be another case like any other, where they take it to court, and there is no real basis for anything, and it ends up being all over the news and then disappearing like the whole debacle over Sarah Silverman's book. In three months there will be another case against AI, and again, nothing will stick, because the people putting the bug in people's ears don't understand how to use most of the functionality of their cellphone, let alone how generative AI works.