The game might have been recorded for 60fps in youtube/twitch, but the game itself was running at 300fps, if you look at some recordings from streamers you will see some of them with their net graph on, there you will see they are playing with 200+fps.
Also Vsync causes a lot of lag input, its never a good option for an FPS game. That's the main reason why 144-280hz monitors are becoming more and more available.