Why can't people who practice the northern emperor law use the lingguan tactic?

Sorry, I don't understand the specific situation you described.

Preparation is a Taoist achievement method, also known as preparation, preparation, preparation, preparation and so on. Guided by the Taoist theory of internal repair, it takes the whole body acupoints as training parts, and combines breathing, thoughts and movements to open all meridians and acupoints in the whole body, stimulate human life potential, improve human physiological function, enhance human disease resistance and prolong life.

Lingguan tactic is a Taoist method, also known as Lingguan Mystery, Lingguan Daoism, Lingguan Zhen Jing and Lingguan Jinke. Guided by the Taoist theory of internal repair, it is an internal repair method combining breathing, thoughts and movements, so as to open all meridians and acupoints in the whole body, stimulate human life potential, improve human physiological function, enhance human disease resistance and prolong life.

Although the Northern Emperor Method and Lingguan Tactics are both Taoist internal cultivation methods, they are different in theory, cultivation method and purpose. Therefore, people who practice the Northern Emperor's Law can use the Lingguan tactic, but they should be careful not to abuse or misuse it.