Nothing against Taiwan or anything. Its just the bloody obvious "first strike" move. China will almost certainly attack Taiwan as part of an offensive-strategy vs the USA.
Having fabs on this side of the Pacific Ocean is important for strategic defense reasons. Of course, the US should move to defend Taiwan in that situation, but if worst-comes-to-worst, we'll need a way to produce chips under such a scenario.
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This story is about Samsung however, which is South Korean. North Korea now has nuclear weapons, as well as tons of artillery pointing at South Korea.
For the Samsung-side of things: same thing. South Korea are great allies, but if the North Korean war ever gets started again, Samsung's production inside the US-proper would be a strategic advantage.