This seems like a great strategy for Samsung. Fabs in Taiwan and South Korea have the same issue. If a conflict arises between China and any western nation (including Australia and New Zeeland) the fabs near China will most likely be shut down or severely damaged. This current weakness actually makes conflict with China and North Korea more likely. By moving significant production to the US, they have a stable area to operate their fabs for decades and the chances of the Chinese stealing their IP and technology is significantly reduced. This also protects them is North Korea starts firing artillery across the border at the fabs.
Knowing Samsung, their plans most likely include company owned nuclear power stations with solar backup. The power plants will be profitable on their own.