I'm not saying it didn't happen... but at that range it's a ~200+moa drop or ~4600" or shooting over a ~37+ story building.
What I am wondering is how do you even aim high enough for that. Does that gun have some crazy sight that allows for ridiculous hold overs? Or are you just aiming up in the sky, and if you're just aiming up in the sky how do you hit anything?
I can understand if you walked it in, but in the video it says he's making some of these shots within just a few shots.