Someone in the article comments pointed out that everything described could be accomplished by a $25,000 off the shelf drone from lockheed [1].
Now that's not something you find on every street corner, but well within the range of 'training some bored enlisted guys' or 'contractors on an evening test mission'. I'm not sure if they sell those to energy companies, but if so that fits as well.
I've heard many stories of crazier shenanigans from those types than "we were fooling around with the drone off flight-plan then got too close to the airport, and they called a freaking police helicopter so we took off lol."
I'll admit that it's a low risk-reward scenario, but especially given all the test infrastructure in the desert out there, it seems more Hanlon's razor appropriate to me than a foreign adversary testing high-end surveillance technology deep in enemy territory completely obliviously. They even left a running-light on!
[1] https://www.lockheedmartin.com/content/dam/lockheed-martin/r...