TL;DR, the author argues that capitalism went wrong starting with the Reagan administration. Laissez-faire capitalism is clearly a mistake, and they argue that we should push back and establish a more progressive form of capitalism.
As a socialist, I would be thrilled if this became the mainstream view. We need to start taking steps toward a more progressive society. Starting by taxing the rich, getting money out of politics, and stricter regulations on business and wealth.
It’s just kind of a funny thing to say “progressive capitalism”. Capitalism itself is a regressive system… but the ideas presented here are indeed good. I like seeing this in WaPo.