Shanle gives insight into Saints Pay for Performance system

What Shanle appears to be saying is that no one was paid for injuries, and these "knock out" and "cart off" tags were applied to big hits but almost as a side note.
It might be exactly that -- like JoLonn Dunbar's big hit that was a de-cleater block on Reggie's punt return TD against the Vikings. Had that occurred under this system, it might have been labeled a "de-cleater" but it doesn't mean the intention was to hit someone so that their cleats leave the turf -- just the end result of a good, legal hit.

And again this would fit into the NFL's word choice of "plays on which opposing players were injured."