I can guarantee you that one of the first builds they had wasnt static, was a long time before Superhot was released too, so it probably was a different build altogether. I think it was at gamescom 2014.
Edit: Yeah, it was 2014. I played that first part, where you move down the corridor in this trailer in VR:
https://www.youtube.com/watch?v=qBSDkr9cK-4
Guess they decided to make it static all together. Walking and camera panning is still a huge motion sickness problem in VR.