What you are describing there is evidence of a complete disconnect between manufacturing employment and industrial output. That’s something you will find in every advanced economy in the world.
Industrial output would be even HIGHER if the USA did not offshore. You seem to be unable to understand that. If 12M make X then 16M would make X + Y. Y will stimulate even more secondary GDP growth Z. So the (Y + Z) part of the equation is still there, but in China and not in the USA thanks to Free Traitors™