For those interested in a pilot's view of this incident, check out MentourPilot's latest video.
https://www.youtube.com/watch?v=Y5K9HBiJpuk&ab_channel=Mento...About 45 min into the video, he quotes a technique called WSPR that can use radio transmissions to track flights. Super interesting, if validated. A less easily digested paper on WSPR technology is available under the video.