It appears that Sikyong Lobsang Sangay is refuting the Dalai Lama who has previously declared that he supports One China Policy
No one is refuting anyone. The evil dalie and the minuscule Sangay are just telling everyday a different story, just because they have no story to tell.
They and others such as rangzenpas just represent a bunch of self-exiled Tibetan mafiosi, ex-slave owners, making noise in order to attract some foreign support in their desperate attempt to survive.
Such crackpots have never served the interests of Tibet and Tibetans; rather, they serve only their own greedy interests, and the interests of their no-less greedy Western bosses.
Therefore it's up to the masses of deceived Tibetans in exile to wake up, to realize that they are just used by such unscrupulous, self-appointed impostors, and thus forever to get rid of such a despicable scum, and go back to their own land and work hard for their country, tradition, culture and religion.