US State Department sets a precedent here by clarifying Taiwan is not part of China. Editors and columnists around the world should pay attention to this, when writing about Taiwan. Many of the conventions and guidelines you’ve been using are now debunked.
One of them was “US acknowledged Taiwan is a part of China” < – plain wrong.
What was true was “US acknowledged that China’s position is that such as such is part of China.”
However, that was China’s position, and not US Position. US has US position, China has China’s position. So now you have it, US State Department URL included.