Where do you think TSMC buys the concrete for their facilities comes from? The copper wiring? What about the rare earth minerals that are used in the production process to make chips? Where do they source their steel from? There are thousands and thousands of components that go into building the capital that makes chips, or just into making the buildings that make up their facilities, or even just the materials for the dormitories for their workers. There is inevitably a ton of Chinese products being used at different points in the TSMC supply chain. The most advanced components are from the US, Europe, and Japan, but numerous other components will be made in China.