The whole idea is absurd. I mean if China really wanted to sabatoge the West, why wouldn't they plant an illness IN THE WEST!?!?!?!
The idea that they started an illness in their own country, shutdown their own economy, and then waited for it to go out west so that they could shutdown their economies and in response stop buying from places like China, therefore getting economically slammed, not once, but twice, is so mindboggling shortsighted, it is almost incomprehensible for it to even be considered.