At first I thought they were just flexing around due to wind pressure deflecting them. But looking closer, on some turns they do pivot to help steer the car. However not every corner, so they must be manually controlled, and not tied into the steering system.
The rear wing also goes up and down at times. He must have 4 arms to drive this car.
Unfortunately the added close-up views of the car toward the beginning of the video make it even harder to look at.
Being bike engine powered, and with everything removed, it must be very light.