Question Are these effects 2d screen overlay ? (With gif)

This game is from a well-known anime series called "Attack on titan". Anyways back to the real topic, I am just wondering how does these weapon effects work (the grapple firing with whiplash effect in the start). I tried to slow down the video to 0.25x speed and my assumptions are the initial whiplash effect are just 2D animation put on top of the screen, after that a normal line renderer is rendered ( I am mostly using unity terms but I think it is the same thing). Any inputs is greatly appreciated !