China has a large share of the active pharmaceutical ingredients (APIs) - think raw materials. India has a large share of finished drugs - like generics - that they produce with APIs from China. The US imports a lot of these from both countries but more prominently finished drugs from India.
I suspect somewhere along the line, with some specific sub categories of just generic antibiotics, or just APIs, or some other subcategory, that 80% and China appeared. And with Hexum's MAGA brain, used that to jump to conclusions he doesn't understand. Of course, all of this is in an effort to justify the cult leader, post hoc.