You're missing the broader point here which is that TSMC pays roughly $50k/year for people with these skills. Sure, you may be able to find the talent pool, but at what price?
I think an important question here is: how exactly can TSMC afford to pay $50k for people with these skills? And why is that impossible in the US? I think this comes down to relative cost-of-living differences: the US is just too expensive to live in these days. Taiwan is not a super low-cost-of-living country by any means, but the US has gotten ridiculously expensive compared to most other peer nations, and this means it's pricing itself out of the market with anything where it needs to compete.
Personally, I think America's reliance on cars and its suburban layout is a big part of this. Workers in Taipei don't need to own a car to get to work, and the overall infrastructure cost per capita is much lower.
