China became the first nation to propose and pledge a No First Use policy when it first gained nuclear capabilities in 1964, stating "not to be the first to use nuclear weapons at any time or under any circumstances." During the Cold War, China decided to keep the size of its nuclear arsenal small, rather than compete in an international arms race with the United States and the Soviet Union. China has repeatedly reaffirmed its no-first-use policy in recent years, doing so in 2005, 2008, 2009 and again in 2011. China has also consistently called on the United States to adopt a no-first-use policy, to reach an NFU agreement bilaterally with China, and to conclude an NFU agreement among the five nuclear weapon states. The United States has repeatedly refused these calls.

Even if they didn't have a no-first-use policy, why would China nuke their own territory?

China’s expanded arsenal – which includes anti-ship cruise missiles, bombers, intercontinental ballistic missiles and submarines – exceeded the needs of a state with a minimal deterrence and no-first-use policy, Alberque said.

fingerwagging the world superpower with the smallest nuclear deterrent by less than 1/3rd, as having "too many"

This is China saying that they know the US is planning to go nuclear if a hot war ever kicks off.

Maybe China should ask for help from Yemen, they seem to know how the defeat the US.