Yes, and shocking, too, to realize that as far back as 1983, at least some people realized this whole guru business was a matter of hypnosis. In fact, it was well enough known for someone to make a documentary about it.
The book I mentioned at the bottom of page 2, Dennis R. Wier's Trance: From Magic to Technology
, is another take on the same thing. There is one unsatisfactory (for me) chapter, where he tries to construct a mathematical model of trances. But the rest of the book is shockingly revealing.
Wier spent many years involved in transcendental meditation. His studies over 30 years lead him to believe that, again, the whole meditation and guru business is nothing but trance induction.