Yes. He did it. In person. Putting in, you know, actual work and character studies.
Robin Williams' daughter's complaint isn't, "AI is easy." She's complaining that impersonating her father in this way is disrespectful and that he wouldn't like it.
Do you think anyone deceased that Robin Williams made fun of, or their families, would've said, "You know what, nevermind that this is disrespectful, it took work!"