The whole point of this article is to rebute the point you've made. From the article:
> The Economist’s basic argument is that because many of the goods exported to the U.S. from countries like Vietnam contain a lot of parts and components made in China, “decoupling is phoney”.
Here's one of the arguments the article makes against this:
> But there are reasons to think that at least part of the drop in U.S. dependence on Chinese imports is real — at least, the recent drop in the last couple of years. First, Chinese exports overall are down substantially from 2021.
[...]
> To the extent that falling investment in China is due to corporate de-risking, it’s probably eventually going to spread all the way up the supply chain. If you’re a U.S. company that moves production from China to Vietnam because of the risk of war, and your Vietnamese factory is importing most of its parts from China, you’ll know it. And you’ll know that you’re still exposed to China risk, and you’ll look around for alternative places for your Vietnamese factory to get its parts and components. That might take time — years even, given China’s dominance of manufacturing. But as long as the risk of conflict stays high for years, companies will keep looking for ways to build entire supply chains that never run through China. And they will succeed.