aerodynamics are really important in cycling but the real technique there was taking his feet off the pedals. that bike has a fixed gear (if you notice, the pedals continue turning with the rotation of the wheel even while his feet aren’t on them), and hte video is taken on a slope, so the actual impediment to his speed wasn’t his wind resistance but the fact that he quite simply couldn’t pedal as fast as the bike wanted to go due to gravity, and so his pedaling motion was actually slowing him down. by taking his feet off the pedals, he allowed the bike to go down the hill a great deal faster than if he’d just kept pedaling normally.
what i do is not up to you 