Indie devs can’t afford to do what this game is doing. You can’t just go into Elevenlabs and generate a voice and use it in your game and sell it, that’s theft. AI voices are based on real voices.

I wish this article had more specifics but it sounds like they paid VAs to have their voice trained into the AI. Unless they hired some suckers it was probably a pretty hefty sum considering the sales pitch would have to be they only get paid once instead of getting paid every time the game needs more voice work.