It’s actually my wife’s voice :D we had a lot of fun with this sound!
Yes if you’re already advanced in the game, the dialogue won’t show up anymore, it’s really to obtain a quickstart so you would need to erase your whole progression for that and the dialogue will re-appear, but it only gives you the 5 first meta-insights points in the end, so if you’re already passed that stage in your game, there is no point in using the code now…