Yes this is true, especially if the person is lagging/has high ping. It can make the killcam/potg look very weird and suspicious.
With that said, I have been hearing increasing reports of aimbots lately.
Watched an Ashe potg video a few days ago and that guy wasn’t even trying to hide the aimbot. His crosshairs were tracking the heads of targets even when they were out of line of sight behind the payload.
EDIT: Found another one with Ashe, even more ridiculous than the first one I mentioned: https://youtu.be/J9ZKitDtuzo
Link from this thread: Dealing with aimbot