The first line of the articles says "seven-millionths of a second", which would be 1/7μs or 0,14μs. They also mention that the camera shot 16 frames in that period, so that would be once every 0,00875μs or once every 8,75ns
Youtubers are a couple of magnitudes away from that, AFAIK
Youtubers are a couple of magnitudes away from that, AFAIK