Good point!
The motion is fast, but ultra sharp is not critical, I think.
Basically there's an Olympic weight lifting gym - Clean & Jerk, Snatch, etc. The excercises are over in about a second from start to finish. They want to get stills of the action for the records, to show the athletes in order to improve technique, etc.
I figured if I ran the camera at 64fps there would be a lot of frames to view. There are loads of posters on the walls from the 60s, the hey-day of Olympic weight lifting, showing long sequences like that. I reckon they must have been shot with something like that. These were at competitions so I highly doubt anyone was bringing in giant lights and ultra high speed cameras. They're gritty, but pretty incredible. I can't find any of the in-action sequences online, but it's pretty obvious they're stills pulled from film.
It doesn't need to be anything like bullets through fruit.