It doesn't need to happen in a day. China has a gigantic spatial advantage here, and as their navy gets stronger and ours doesn't (or, worse, gets cannibalized and weakens), influence shifts. It's a good bet that as this trend continues Taiwan's choices will align more and more with Chinese interests and less and less with US interests.
And again I repeat: if you want to talk about radical changes to global geopolitical balance, you're talking about a rather different subject than "Can China Make a Good CPU?".
Yeah yeah, sure, it could happen. And if it did the last thing any of us would be concerned about is whether or not AMD shared innapropriate technology.