Thank you and welcome to the forum. Strangely enough the growth in popularity of drones in recent times was in my mind when I watched the video. I'm not into aviation particularly, and had to Google NOTAM to find out what it was. I'd have thought an event like this would be of interest to drone operators. Are NOTAMs routinely issued in all instances of low flying permissions being granted, because if not, today's train in addition to raising rail safety concerns should also be raising aviation safety concerns.
Thanks for the welcome - long time lurker here background, Broadcast Engineer, PPL pilot pleasure flying & licensed commercial drone operator.
At the risk of thread drift, NOTAMS are an interesting beast - it isn't compulsory to file them, but it's considered good airmanship to do so if you're doing anything odd - they take time to be communicated. The overriding principal of flying for light aircraft, drones & helis is VFR - the Mk1 eyeball, the pilot is responsible for lookout. Despite this I would certainly have at least expected a NOTAM to be in for Arenas antics today & had I been operating in the area with a UAV I would've had a 'brown trouser' moment had nothing been NOTAM'd & had to get the UAV out of the way pretty damn quick. There is a concept of equivalence in aviation - manned & unmanned aviation work to the same rules (give or take a few bits)
For comparison - similar permissions are issued for air shows & those are NOTAM'd, but they are likely planned months in advance, most broadcast planners don't look beyond their horn rimmed glasses, I know that one from bitter experience.
Personal opinion - G-TAKE didn't NEED to be where she was. The lens on the camera on that aircraft is sufficient for close fine detail at a greater distance. The risks were not commensurate with the likely reward. Was it safe? In the event yes, was it wise? Probably not, but that's a subjective point.