If they really hired someone who sounds just like her it's fair game IMO. Johanssen can't own the right to a similar voice just like many people can have the same name. I think if there really was another actress and she just happens to sound like her, then it's really ok. And no I'm not a fan of Altman (especially his worldcoin which I view as a privacy disaster)

I mean, imagine if I happened to have a similar voice to a famous actor, would that mean that I couldn't work as a voice actor without getting their OK just because they happen to be more famous? That would be ridiculous. Pretending to be them would be wrong, yes.

If they hired someone to change their voice to match hers, that'd be bad. Yeah. If they actually just AI-cloned her voice that's totally not OK. Also any references to the movies. Bad.