Honestly, I kinda think this is an okay use of AI. It's still a bit of a grey area (though it sounds like CDPR reached out to the family to get their approval first, which is very considerate of them) and the voices of dead people shouldn't be used for new characters, but finding new voice actors for established characters can sometimes change the character's personality which kinda sucks.

That said, it definitely shouldn't be used for new characters (with an exception for niche scenarios, like if you're trying to make a fully proceedurally generated game), and I think using it in situations where the actor is busy or doesn't want to renew their contract is very questionable.

This seems like the best possible use case, presuming both the actor’s estate and the new voice actor will get paid. You have the benefit of a human actor driving the cadence and emotion, then overlay with the transformation so unknowing players aren’t taken out of immersion by a sudden switch in a character’s tone and demeanor.