This claim implies that it took no significant time whatever for the disease to spread from Wuhan throughout the rest of China and that now all of China can be assumed to be essentially free of the disease. (There isn’t enough salt to take this with.)
A hypothesis worth considering is that China is desperate for foreign exchange earnings and is getting ready to order its population back to work at risk of being infected or not.
A second hypothesis worth considering is that the Chinese have found that, outside of particular identifiable segments of the population, the death rate from the Coronavirus is much lower than initially believed, perhaps comparable to that of the flu.
P. S. If you don’t like the empty store shelves, wait ‘til you try socialism. Under socialism, empty shelves are so common that it’s such an event when a store has something worth buying that a line immediately begins to form without people even knowing what it is that’s available.