This Mantra is especially linked to the 4-armed Shadakshari sort of Avalokiteśvara. The Dalai Lama is alleged to be an incarnation of Avalokiteshvara, and Therefore the mantra is especially revered by his devotees. Chinese esoteric Buddhist exercise was determined by deity yoga and also the "a few mysteries": mantra, mudra https://www.instagram.com/tantramantraaurvigyaan/