The speakers on the video agree with your suspicions.
They believe that the technology required is not generally available on the market and was provided as a “perk” to this prominent photographer.
In action the speakers suspect that the photographer was “tipped” that the camera would be “useful” on that particular day at that particular location.
This may be a trail that leads nowhere—or everywhere important.
See my post 6.
I’m curious how many other Trump rallies this photographer had taken photos of Trump at, previously.