In Vajrayana Buddhism, the correct view of the guru is as the complete embodiment of all buddha families, the principle of all the mandalas, the embodiment in the single form of all yidams. We think that the guru’s body is the Sangha, his speech is the Dharma, and his mind is the Buddha. This is common knowledge amongst all Tibetan Buddhist practitioners.
Therefore for the Dalai Lama to claim that his gurus were wrong would be such a ridiculous statement and one that contradicts the foundation belief in Vajrayana, such that everyone should know that there is a deeper meaning behind the Dalai Lama's words. His Holiness, like the Buddha has always encouraged practitioners not to simply believe in everything we hear. The Dalai Lama is very wise and skillful and was in fact asking people to realize how wrong the basis of the ban was. Those who truly understand the Buddha's teachings, especially the tantras would never agree with the Dalai Lama and would instantly realize that there is a bigger picture in play.