The good news is this domain doesn't call for cutting edge, 2 nm process.
There are more than a half dozen fabs in the US which can produce networking chips like ethernet controllers, line drivers, SOC, etc: Intel, TI, Samsung, et al. If US wanted to onshore routers, we could make it happen.
a router produced in the US from foreign-made parts - like controllers, drivers etc. - is not in the "covered list". Although I admit the wording is vague: "produced in the US".
There are more than a half dozen fabs in the US which can produce networking chips like ethernet controllers, line drivers, SOC, etc: Intel, TI, Samsung, et al. If US wanted to onshore routers, we could make it happen.