That is NOT referring to China's claim over Taiwan, but Taiwan's claims over the Mainland...
They are. But when they do you tell them to shut up and that they are causing problems.
Our original mistake going back to the post WWII period was basing policy related to Taiwan on what two despotic regimes said.
That we have not altered it after 50 years is a tetamont to the inertia and incompetence of the foreign affairs elite.