Ironically, the pic at the top of the article has many bikes painted "Trek" in the background despite the caption saying it's Giant's facility. In truth, pretty much every major bike manufacturer makes their frames in Taiwan, often in the same facilities. Decals and branding are applied after.

There's a huge amount of manufacturing know-how and infrastructure around bike manufacture in Taiwan, especially around carbon fiber manufacturing. You can even go buy a carbon frame design in Taiwan, you pay more for the design if you want it to be exclusive.

Therefore, it's not terribly surprising that they moved to Taiwan. If they were moving to the US that would be something.