The real issue with Chinese New Year is shipping, and customs.
Shipping will shut down, along with customs. What happens is a branch of customs review products as they leave China, and they check to see if the products and the value declarations are correct etc....
and that branch is govt. ran, so they do as they please, when they please and if memory serves me correct, they close before shipping does.
These holidays are mandated, and to the best of my knowledge there are not "alternate shifts" for Holidays like we do in America. In other words, China shuts down all at once.
Cities become ghost towns, to the point where buying an apple is a challenge. When I was a kid, we would stock pile food for Hurricanes.... in China, you stock of up food for the Holidays!