I’m assuming that Taiwan already has nukes. And that several of them are at various spots along the base of the Three Gorges Dam. And a big, dirty one several kilometers back from the dam.
Invade, someone turns a key. . . and within an hour, most of China’s industrial heartland is a radioactive hell of ruins destroyed by a near-supersonic wave of live steam. . .
I strongly doubt that.
When, not if, but when, China Moves on Taiwan it will be quick and dirty. Expect a Chinese Fifth Column to rise up and most of the Chinese army will fly in. No Ukraine here, quick and dirty war fueled by corrupt people in Taiwan Government seeking new jobs in the Communist Chinese state of Taiwan. The rich will survive well, the not so rich, not so much. The USA and Japan will have little time to respond to fast changing events. Over in two weeks.