some years ago on Australian TV , there was an ad running for a particular hospital/medical benefits scheme, I think it was MBF, anyway the ad ran a series of short vignettes of various types of practitioners doing their stuff. A physio, a chiro, a masseur etc , at the end there was one asian looking fellow holding two large fish over a "patient", occasionaLY slapping them together while producing a humming chant.The message was , that pretty much any type of "therapy" was covered by this insurance. Even down to the patently ridiculous.
I venture to say cranio sacral techniques could be grouped under Fish Slapping , along with many others.