More information can be found on this GitHub page.
I linked the FitMC video because he does a decent job explaining it at a basic level and the SpawnMasons, a 2B2T group, are behind the GitHub post.
The original title of the video was “RANDAR: Minecraft’s Most DANGEROUS Exploit” but that was a bit too clickbait for me.
It is neat. I have been binging FitMC’s content and with the amount of betrayals in 2B2T I am surprised it lasted so long