I was trying to find that video to prove my point, thanks for that. This is what any counter measure is up against, if you think a shogun on a drone can hit something even moving at half the speed of those FPV drones zipping around I got a bridge to sell you.
A FPV drone is $500. A drone with a gun, sensor, stabilization, tracking and oomph to carry all that load will be easily 10x the cost, in fact I can fairly confidently say that it will be the floor cost, a DJI Matrice 30 which theoretically has the payload capacity without any of the actual required hardware is $8k, despite its price tag it's camera and gimbal is certainly incapable of tracking a FPV drone.
This is a drone with a net gun against slow flying drones, for reference that even a small amount of unpredictability greatly hinders operation.