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.
My favorite part of the story is when he entrusted the exploit to one faction who used it for the good of the server.
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