A sub one hour 300k?

I stumbled upon this video of a cyclist clocking 207 mph on TopGear.com today. That's 333 kph! He could complete a 300k brevet in less than an hour. Of course, I'd have to DQ him for not stopping at controls and having a rocket pack on his bicycle.

At 200+ mph, I'm not sure how much that helmet would help.

https://www.topgear.com/car-news/video/watch-man-do-207mph-bicycle