This article has to be completely disregarded because of the inclusion the strobe light issue. It’s been completely and totally debunked over and over yet included. How can you take anything else in the article seriously if the author is not smart enough to see the truth... it was a strobe light.
I would not be surprised if there were first responders on the ground or a lower level rooftop of the hotel who were returning fire against the perp on the 32nd floor.
The easiest explanation to support the strobe reflection is where are the holes in the windows that the tin-foil crowd keeps trying to propogate. The windows are fixed in place structural panels from floor to ceiling and weighing about 700 pounds with the frame structure it is sealed to. Only removable from the outside because of the way it is sealed to the frame.