The true sutra refers to the Taoist sutra, and the Dalagni mantra sutra of Bodhisattva's wishful mind is the Dalagni sutra of esoteric Buddhism, so it is not the true sutra.
Viewing Bodhisattva's Bodhisattva Prajna Heart Sutra, which comes from the big edition of Ruyi Wheel Prajna Sutra, is about Ruyi Wheel Prajna and its function.