That’s exactly it. Every one of those lines was an FPV drone with a bomb. In addition to being impossible to jam, they also don’t emit any signals so they’re harder to detect.

Oh and you’ll notice in some FPV videos that the video degrades as the drone gets closer to the target. This is generally due to signal interruption because of trees or terrain in the way. Fiber drones can fly as low as they damn well please with perfect video.