This brought some old memories to the surface. I was hit by a car pretty badly when I was a teenager. I've actually flown above the car and landed into the road, but somehow I've managed to protect my head, so I have a clear memory of this event.

While I was spinning in the air, I saw everything in slow motion for a few seconds. Clearly in slow motion! In fact, it was how I've managed to protect my head when landing. From my personal anecdote, I think think this article's hypothesis is unreasonable. My brain kind of overclocked itself to give me an advantage in that situation.