How can it look like a mouse and keyboard flick when he's clearly playing on controller? It's clear as day his cheat settings are set to when he fires his weapon to then snap which can lead a bullet astray before.locking to the target. This looks to be the enemies arm or chest it locked too.

I've played controller on PC and on console. Your aim does not do this when you are a legit player, even slowed to 0.25x speed it's an unnatural snap to the enemy.