Earlier quoted context omitted.
In the event of a full-blown war the United States could just take possession and control of all foreign-owned fabs in the US.
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.
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 politics would be the rule. Look at China's history to see its future after a nuclear war: