They're explicitly pointing out that the US (and most of the western world) has abandoned the manufacturing sector of their economy, outsourcing work that used to employ millions of people to the developing world.
This is a trade-off that can benefit both countries, but, it is wise to consider both WHO benefits from this, and what the LONG-TERM implications of this entails. It's great for an investor class in America that has the capital to create factories in China, and it's great for China to take USD and start to employ their workforce. But, the question is whether or not this is actually a good thing for the American worker.
The rust-belt would certainly have an opinion on this. My father was a factory worker that was able to support a family on a single income, and when that manufacturing plant closed, it absolutely destroyed the finances of my family.