They said the same thing about HK: "If the US walked away from HK that puts Taiwan, South Korea, Japan and other allies in SE Asia at risk. Not going to happen"
That's a bit different. While China did for all intents and purposes violate the agreement it had signed in the 90s nobody would question the legitimacy of the handover itself. Hong Kong of course doesn't have the American military machine deployed within its borders either. Having driven by some of those bases I'm kind of in awe - and that's just the stuff on public roads.
It doesn't really matter in the big picture. How would the US look in a month or six if we by war stopped all products from China today? The US would become unrecognisable. The economy would be so destroyed it would hardly be a victory no matter what casualties says on the two sides. Even if we nuked some of our own cities we would be better off than after winning a conventional war against China. No, a war against China is unwinnable if the US of today needs to be there post-war.
How would china look with no money coming in for six months? China is incapable of standing on their own. Propped up by IT theft and copycat companies funded by the CCP. Dry up the money and it’ll be the USSR pt 2 in China.