I applaud your use of logic. But I've learned in 2021 it is best not assume the logical will happen.Nightmarish indeed but very unlikely. The notion that Biden is “Beijing Biden” is laughable at best and those on the right need to stop buying that. China pursues what’s best for China and that does not involve an invasion of the US. The US starting a war with China is much more likely.
A realistic worst case scenario is an intentional degradation and restriction of supply chains especially to areas outside of major cities. Basically an attempt to starve these people out and force them back into the cities, which is where the hammerstroke will fall hardest.
All I know, is I know nothing.