Must be something new, it's been a while since I checked his patreon page. but most likely might not involve Twist, at least not until it's completed, so he would probably start with adding sound to his new game and slowly add sound to the twist on the side.KSTs patreon says otherwise.
but even then, the goal would have to be met, before he begins adding sound. and I don't see that happening before the end of the game.