As a person who doesn't really know what's going on, here's my two cents.
Valve doesn't seem to really like having NSFW early access games on Steam anymore (or more accurately, they've probably been pressured into being more careful about what ones they allow). Ones that already exist might be allowed to continue existing, but new ones would probably get rejected. So a Steam release would probably have to wait until Kincaid is a complete video game.
So we'll probably be waiting a while. Although a touch-up of the Steam page to make it more up to date would be appreciated~