For one it's a peace-time situation where strong-arming interventions are met with consequences, in this case China can stop supply of critical products to punish the Dutch. In a wartime situation such supply would've been stopped anyway, so there is nothing further to lose and everything to gain from an intervention, but such an intervention is only possible if the factory is on your soil.

Second, Nexperia is a legitimate Dutch company with Dutch expertise. The Chinese bought it. The Dutch don't need Chinese expertise to operate the local factory they built and sold to the Chinese.

Third, China is a global hegemon, South Korea isn't by comparison, and South Korea is a neighbour of China, the Netherlands isn't. China could pressure a battery factory in South Korea during a military conflict by military force, but in Western Europe that's a different story.