Destroying TSMC or knowing it would be sabotaged would pretty much be the point of the operation. Would take 48 hours and they could be out of there again and say “ooops sorry” at the UN.

Hard disagree. They need chips bad, and it's the US defense position that TSMC be destroyed if possible in the event of successful Chinese invasion. They also care about reunification on principle, and an attack like that without letting them force "One China" on the Taiwanese in the aftermath would just move them farther from that goal.