Actually, he does.
It is mentioned the 2nd episode would be released in FULL in the very near future. Vague? Yes. Owed? 100
If you use those things called eyes to read, and read the description up above on the game, it literally says when you buy the Founders edition, which is the one edition you can buy, you get episode 1 and it comes with episode 2 as well, as it will be finished "soon" according to the description. Now there is no episode 2 left, so thus yes he at least owes us one more episode.