How do you come to that analysis? not that I particularly disagree with it.
The jpg image includes the camera model and the lens focal length in a data field. Knowing this, the size of the gyro (in pixels) can be compared to the known size of the gyro and the camera sensor. Knowing the lens focal length allows the distance to be calculated, by knowing the true field width of a lens of that focal length.
Using the least optimistic dimensions gives a range from camera to gyro of about 1400ft, so perfectly legal. I'm sure it was very annoying to those on the ground, even though it was probably legal. In my experience, those unfamiliar with aircraft very often grossly underestimate their height.
VP