The numbers are cooked up. See https://qz.com/1269172/the-epic-mistake-about-manufacturing-... from above.

Basically if you ignore computers, there was zero growth in manufacturing sector. If you take computers into account but ignore processing power increase, there was zero growth. So pretty much the only driving force in the manufacturing sector for the last 20 years was Intel, AMD, Nvidia. This is even with the increased productivity per person in manufacturing sector (so there was also massive reduction in employment).

It is highly concerning and the numbers were very much cooked up.