Maybe manufacturing the chips in China isn't really a problem. Many companies from other countries manufacture their products in China, and they control that the producers don't "tamper" with the design of their products.
[...]
Slightly off-topic, but it's worth pointing out that the truth is rather dire in this regard:
https://bgr.com/2018/10/04/china-hardware-backdoors-sophisticated-chips-used-in-us-bound-tech/In short, supply chain attacks on hardware
do happen. However it doesn't appear to be as critical if you only produce the chips in China and assemble the rest of the hardware within a trusted environment (ie. backdooring a chip is much harder than backdooring a motherboard).