[This sounds like total BS. The Chinese and Russians always brag up their weapons but in the end they hardly ever work as well as advertised. This sounds like another setup against Trump, something like, See Trump cant protect the US from the Chinese only a fellow communist like Joe Biden in the White House can protect us. Don’t fall for this obvious fake news psyop bullshit.]
Even if it works, what country is going to fire a nuke against the US, given that it has a robust second strike capability? The very detection of the US-targeted ICBM launch trajectory from Chinese bases should result in a saturation counterforce and countervalue nuclear strike against China. At the end of which the major Chinese cities and military bases should be in smoking ruins. Which is why China’s leader won’t take that step. It’s also why I see any conflict with China to be restricted, like the Korean War, to (1) targets within the territory being fought over and (2) remain conventional. Because anything else would be catastrophic for both countries, unless one or the other managed to wipe out the other side’s nukes without being nuked itself.