Would this be possible?
Okay so since the flipper can send radio signals, would it be possible somehow to figure out what channel a TV is on and send signals of that channel's frequency to display stuff on the TV? Or am I completely misunderstanding the whole way this works
The transmitters on the FZ are not made for sending TV signals. You also need to have a license to transmit on TV frequencies (generally speaking).
Okay, could it be done with some external module?
Probably. You would need to get an NTSC encoder and an amplifier, plus a ton of passives.