The Japanese used to fly Buddhist priests around to POW camps to teach a lab course on how to behead. As part of the graduation exercise they would pick out a few POWs at random, and have the students demonstrate proficiency.
The combination of Shinto and Buddhism as historically practiced in Japan is a fair distance from the teachings of Siddhartha Gautama Buddha. In Japan it became a warrior religion with accompanying meditation. Nothing in Japan is simple.
That’s a new one on me. Most can you supply more info, or a url that can confirm your statement?