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.
The exploits that comes out of 2b2t are always super impressive. Nocom was also a wild one.