Earlier quoted context omitted.
The PRC is a nuclear power. In the event of a full-blown war there will be no fabs in the US, foreign-owned or otherwise.
Do you really believe China has enough nukes to take out most of the USA's infrastructure? Fab facilities would be waaaay down the list of targets. China's goal has been to maintain a nuclear deterrent (make it not worthwhile to strike China) rather than an offensive capability. if nukes flew then China would likely fragment into many separate countries: its centralized command structure would be destroyed and local…
It's hard to tell what you intend by your DDG link, but perhaps you are suggesting that, in the case of nuclear war, China will effectively revert to the Warring States Period of 2500 years ago. Is that really your intention? What would the US look like if it were returned to 2500 years ago, before the rise of the Anasazi and the Mound Builders, before the Olmec invented writing? A much more likely outcome than this sort of quasi time travel is that either a post-nuclear US or a post-nuclear China would look like nothing ever seen before in human history, more closely resembling the world in the immediate aftermath of the Chicxulub impact.