YES IT IS. I'll post it again, you're using half the definition. It does not matter if the player is targeted or not, it is tracking of every route.
What is Next Generation Stats?
NFL player tracking, also known as Next Gen Stats, is the capture of real time location data, speed and acceleration for every player, every play on every inch of the field. Sensors throughout the stadium track tags placed on players' shoulder pads, charting individual movements within inches
The imperfection is that it doesn't quite account for when DBs break off their coverage or really account for passing lanes that are blocked by zone coverage.
I'm sorry you're too lazy to actually go to the website, but it is right there in black and white.