Thatd be quite a feat. John Fire Lame Deer died back in the 1970s. This seems to be his grandson or perhaps a great nephew trading on the family name. The kid looks all of 17. Seriously, I doubt hes out of his 20s. Not only ceremony selling, but done by one who couldnt possibly know enough.
Weve had this issue come up before where someone grew up with a father who was a ceremony seller or exploiter. (In this case the father Archie, not the grandfather, John.) If he wanted to give lectures as someone with insight into his famous grandfather thatd be a different thing.