I will be freezing the ball with 1/10,000 second duration flash pulse from my QT1200 strobes, not with my shutter speed, same as this guy is doing, and my R3 will flash sync at 1/250 in EFCS mode. Using flash and then ALSO trying to use fast shutter speed is misunderstanding entirely what you’re doing.
Volleyball is really predictable, it’s the only team sport I will promise photos of each player ahead of time. Set up for the front row and you have a 1/3 chance of getting a hit each play, then move to set up for the back row and same 1/3 chance, and that’s if you’re just picking a player to focus on at random rather than trying to react.
I shoot with wide aperture prime lenses (40, 105, 200, 300) to get maximum light and background separation, which helps.