I don’t even know if I agree with that tbh - I’ve yet to see anything that actually shows that AI voiceovers can replace human ones. Oh they can make realistic speech, but they can’t voice act. A voice actor isn’t just a person who reads a script in a monotone, they’re an actor.
AI will probably eventually get good enough to understand the context of the dialogue and add the appropriate inflections and such - but nothing today comes even close