"Undo it" means unwinding our dependence on Chinese manufacturing. It has nothing to do with AI chat bots. And it's already happening for numerous tech companies in industries like computer and consumer electronics manufacturing. China is no longer a low cost manufacturing nation for many of the goods that American companies originally offshored there over the past few decades. So now it's not even low cost manufacturing that's holding several of our industries there, in many cases it's simply inertia. But as US companies work to move manufacturing out of China for their own reasons, it's possible that the increased tariffs on Chinese-manufactured goods will hasten those moves. Still, like I said, it took decades to get there, and it'll take decades to untangle it all.
As I stated above, China is no longer a low cost manufacturing nation for many of the goods that American companies have offshored there over the past few decades. And also like I said above, American companies are already making moves to unwind. The supply chain issues highlighted during the pandemic were somewhat of a wake-up call to many American companies, but also the fact that China's just a real pain in the ass to do business with, and if they're not the lowest cost manufacturer, then there's no need to bother with it. Add increased tariffs on top and it looks even less appetizing to continue manufacturing there.
I don't expect manufacturing jobs in textiles or shoes to return to the USA, but there's plenty of opportunity for high tech to do so. It's already in process for many companies.
This has all been discussed at length on the China thread, which is probably a better place for this discussion, since the tariff thread isn't specific to China.