The US does not have an active defense treaty with Taiwan
There is the 1955 treaty, which is arguably never been legally repealed, and its current nonfulfilment is legitimised through a weird estoppel logic that the Republic Of China is not a party to treaties it itself signed with the US, to not to evoke again the constitutional dispute about the legality of Carter's termination note after the Goldwater case. For the US domestic law, that note has no meaning. It's not even a formal executive order.
So, whether that defence treaty is active or not wholly depends not even on its ratification status, but on whether people continue to collectively imagine that the Republic of China is not the same China which signed Republic's diplomatic instruments with America.
As for your last statement, go argue that with the US State Department.
How it looks from the side:
— "I promise, I will die for you, and our brotherhood"
— Enemy comes
— "We never promised you anything! And you don't know how to read English", runs away
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