He is doing the classic, newage, throw diverse cultures in a blender, and falsely claim they are all the same. That way when he bangs a frame drum and howls incoherently, and babbles in German with random words from other languages sprinkled in here and there, or random cultural elements vultured here and there, he can claim he's not an appropriator, "because all is one." It's the same thing Michael Harner does, and many Unitarians.
But traditional cultures are not like that. Traditional cultures do all seem to have this in common: a belief that you must speak the language, and that the spirits are real, and they have very real things that they do and don't like you to do. That's what tradition is. So things that would appeal to one culture's spirits are offensive to another's. When you throw it all in the blender, and disregard all protocols (or don't know them in the first place) either the spirits don't come, or they come and drive people crazy. People can watch his videos and come to their own conclusions about what's happening there. Or don't. I wouldn't really recommend watching. I found it disturbing.