A professional voice actor ways the audio of RBG is not her:
https://youtu.be/hiowRLnoQfs?t=2632
Sounds far-fetched but this fellow is a pro and is well-respected for his talents and experience.
She would have to be working from home & calling in, for this to be pulled off; too many people to fool otherwise.
It could be both - voice actor makes tape or over conf call, it’s inserted to reflect her “participation”
If they were going to fake her voice they wouldn’t need an actor to impersonate her. There is software that has been out for years that is often used for voice overs in movies. You can have anyone read anything, and then have it replaced with her actual voice. Easy peasy.