look at the top voted comment in this thread - the narrative is some sort of escalation from Xi Jinping when unification with Taiwan is boilerplate rhetoric which every leader since Deng says at Party Congress.
PRC position has not changed - commitment to unification by peaceful means, but war never off the table.
Instead he says reunification would destroy TSMC because of how dependent it is on overseas suppliers.
Tsai is not entirely a creature of the US, and has indirectly - perhaps initially, inadvertently - manipulated the US by pushing for an unendorsed independence, forcing the US to deal with a situation they hadn't before considered - a 'two china' outcome.
However, now that US does sees this outcome, it cannot unsee it and is thus driving hard to secure that outcome, no doubt as a stepping stone for the long term goal of regime change in PRC
As for Chang, I think status quo is his ideal outcome - de facto independence, TSMC servicing two of the biggest economies in the world, and therefore, the entire world. Not happening now though, sadly