You do realise that when he tumbles there's a camera lock, right? I can see that you decide to do slow-motion whenever he tumbles, and at 0 : 37 you stop the video with a text that says "this is impossible legit"- he is tumbling at that moment aswell.
https://i.gyazo.com/df7f164bde9af1cd...5ce259f61a.mp4 - Here's a video of me doing it. If you record yourself and watch the replay you'll see it like this. In a replay the camera does not follow where you aim during a tumble.
You can see in the replay that he follows your every move, but I'm guessing that just like in the screenshots of the gungame he's 80+ ping to you here aswell which will definitely make a delay (everything you see here in the replay, he sees 0.5 - 1 second later).
It's a no from me, clearly the player is legit.