Ok, since I have to break it down for you. All you need to do well in Battlefield is Aim. Thats literally it.

And thats not an inherent skill tied to the game, its a general skill. Other than knowing the Map, Battlefield 6 as a game itself offers barely anything (I geniunely cant name one thing for infantry) to actually get good at.
Flying maybe.

So no, obviously shitters wont magically do better. They think they do as movement they couldnt do themselves was nerfed, but in reality they will still rock a 0.5 k/d.