The US protected Taiwanese sovereignty for decades before they even had a single semiconductor fab. This idea of "the silicon shield" just shows a complete ignorance of the history of Taiwan and its place in the geopolitical order.
The past is of no value in predicting the future right now.
That was before the current administration wiped out the very idea of "soft power" and put everything including NATO up for disposal.
There is, frankly, no way for anyone to trust the US again until the US undergoes steps similar to post-1945 Germany.
So the time of military US protection is behind us.
In an interview reported by Reuters, he said he’d impose 150%–200% tariffs if China “went into Taiwan,” and when asked about using military force against a blockade he said it “would not come to that” because Xi “respects me” and knows he’s “crazy.”
https://www.reuters.com/world/trump-says-he-would-impose-tar...