It's surprising how many videos the lion kingdom has no memory of recording. In most cases, lions can remember making a video on an invention, but nothing about how the invention was made. It's a case of lion intelligence being augmented by machines.
In this case, it was a forgotten 2 way serial port. It sent data over 72Mhz & received data over the audio channel of a 2.4Ghz cam. The cheapest UART radios of the time were $40 & there was no such thing as editing config files on a phone & sending them over bluetooth. 72Mhz & 2.4Ghz couldn't operate simultaneously. They needed a 1/2 second delay between sending over 72Mhz & receiving over 2.4Ghz. It took a piece of heroic PIC assembly language to make it transparent to the user. It was never used.