Well sure, I agree, but we are way far beyond that.
What can they realistically do?
If they want to deny China semiconductor chips, how is that even feasible?
Then the question at hand,
Are two supply chains acceptable to the Americans?
If not, like you indicated, then how can they prevent that alternate supply chain from forming?
The first strike is the only creditable strategy here. Of course, China would just launch themselves, fulfilling American dreams of Armageddon. I do not believe that this will happen.