Not surprised. Didn't know about them either until a few months ago, but when I did, it was amazing.
Both talk about anarchy and modern unenlightened society, through Mark often speaks about the occult, since he is a former satanist who had a change of heart and decided to expose them. Larken is a common sense kinda guy, in the way that whatever you hear in his lecturers you probably already knew, but haven't realized it yet.
Favorite Larken Rose lecture: https://youtu.be/LD4fRPwd-XY
Favorite Mark Passio lecture:
https://youtu.be/VoUsVMZ3EJw