This technology can virtually extend the voice of an actor, years or even decades after they have retired.
https://people.com/movies/james-earl-jones-steps-back-from-voicing-star-wars-darth-vader-report/
That seems to be the plan for the STAR+WARS productions.
Digital Audio Synthesis can very well indeed, simulate accurate voice reproduction for future projects.
https://www.indiewire.com/2022/09/james-earl-jones-retired-from-voicing-darth-vader-1234766322/
Of course when something has happened to an actors or singers voice, the tech is there.
https://www.goodmorningamerica.com/culture/video/val-kilmers-voice-recreated-ai-79534893
However, just like Deep Fake tech, there is always the potential for someone to mess around with things for a sinister purposes.