They literally have manufacturing facilities in the US as well due to the IBM acquisition. This article seems to gloss over the reality of them being globally diverse for a while.
What will happen is that the Chinese government will just take over manufacturing and plants and continue to make the same products under a Chinese name, the same way Russia rebranded a lot of companies that left then when the war started.
Lenovo is already a Chinese company. They're just moving production for US bound products somewhere else. I guarantee most of their production will still be in China.