Why can't Yuan Tiangang's internal force be absorbed?

There are yin and yang. According to the inquiry, Yuan Tiangang's martial arts belong to the type of Gangdayang, while the black-and-white impermanence of practice mostly belongs to the type of yin and cold. In fact, the nine mysterious magical powers and poisonous palms practiced by black and white impermanence are indeed mutually restrained by Yuan Tiangang, so Yuan Tiangang's internal force cannot be absorbed because of the existence of Yin and Yang.