If you want to check pilot licenses, do so here:
https://amsrvs.registry.faa.gov/airmeninquiry/
The plane that AF was pictured next to is a Aviation Club plane. That is a plane that many people belonging to a club own. Pilots in the club buy a share and pay dues. This is a good way to have access to a plane, without having the sole expense of owning a plane yourself.
Clubs charge an hourly rate to fly the clubs plane. The time a pilot uses the plane is usually kept track of on a time sheet based on the hour meter in the plane and each pilot is billed at the end of the month for the time they fly, along with monthly dues.
It would be very hard for anyone to use a "club plane" and not record their time. There would be a lapse in time on the time sheet and it wouldn't take long to figure out someone flew the plane and didn't record their time.
All planes are now required by the FAA to have Automatic Dependent Surveillance -Broadcast (ADS-B). This is a system that sends a signal to the Air Traffic Controllers to tell them, where the plane is, what the tail number of the plane is, what speed the plane is traveling and what altitude the plane is at. The ADS-B data is recorded and could be used to track a planes past movements. As I said before, the plane that AF was pictured next to, did not fly on March 31st or April 1st according to the ADS-B data.
The ADB-B system could be turned off, but it would throw up huge red flags to Air Traffic Controllers since the plane would still show up on radar, just with no information. Radar data is also recorded. So if a plane left the home airport where this plane is based without it's ADS-B system on, it would be known.
Student pilots must fly with an instructor until they have been signed off to fly solo and have a current medical certificate. Student pilots can not carry passengers unless their instructor is with them. A student pilot's solo endorsement is only good for 90 days. Someone in a club that is a student pilot would not be permitted to fly a plane solo without a current student solo endorsement and medical certificate. Someone who received their student pilot's license years ago and has still not obtained their private pilots license, is probably no longer flying. Second Class medical certificates are only good for 12 months. (A second class medical certificate issued 9/2020 would be expired)
A student pilot has enough on thier hands just flying a plane by themselves, much less trying to open a door (which is just about impossible when flying, try opening your car door going 110 MPH) and tossing large things such as a body out without loosing control.