This isn't being brought back from China, TSMC is Taiwanese and operates the overwhelming majority of their fabs in Taiwan. They have a fab in Shanghai and Nanjing which I believe is both not their leading-edge process and to supply the mainland market. [1]
From what I've heard they have no interest in moving their closely guarded leading-edge processes out of Taiwan, and this is probably a domestic fab for supplying the military with on US soil.
It's in the best interest of Taiwan to keep their 2nd highest GDP producing industry inside their own country. If a war breaks out between China and US, TSMC factories in Taiwan are going to be the safest place on Earth. No country wants to loose what TSMC has to offer, including Taiwan itself.
From what I've heard they have no interest in moving their closely guarded leading-edge processes out of Taiwan, and this is probably a domestic fab for supplying the military with on US soil.
[1] https://en.wikipedia.org/wiki/TSMC