No he didn't. The main story was written by Daniel Butterwoth (Foxhunter). One chapter was written by me. I don't know of course what they changed or added to the story after I left the team or who else worked on it.
The story is kept quite secret... so very little is known. Not much more than what is stated here and hinted by the sketches and screenshots. They don't want us to know more. They want us to find out by playing the game when it's finally released. In my opinion that's not a bad idea.