The piece puts increasing trade deficits next to lots of stuff about increasing inequality, but it does not make the case that trade deficits are the cause of increasing inequality.
There's a person that had a job making physical things, but they are not inherently a "person that only makes physical things." The idea that bringing back the making of physical things will make these people wealthier is, well, suspicious. Unions? Better taxations systems? Modernizing manufacturing so that each worker is far more productive and we can compete with the world? That may help. But reducing trade deficits will not fix any of the K shaped economy.