Those look to be an over-engineered solution to a problem of having a one-way door. Much simpler would be a large revolving door (the better to accommodate passengers and luggage) with a motion sensor that sets off an alarm if someone passes through the “wrong” side of the circle. Or even a turnstile with motion sensors to prevent backflow.
This is some parasitic govno-mint contractor selling TSA an overpriced, overly complicated device. Wonder who’s getting the kickbacks and how much they are. To be clear, they are NOT at terminal exits, but at the exit of the secure airside part of the terminal. They are also not body scanners.
