I think you summarize well, and that's one of the main problems with this essay. The author clearly works from the perspective of Marxist theory of capitalism,

I think you summarize well, and that's one of the main problems with this essay. The author clearly works from the perspective of Marxist theory of capitalism, and manages to miss one of the big points of the theory – that increased productivity always leads to more exploitation in the form of increased extraction of surplus work. The theory is explicit that increasing productivity is the capitalist's last mechanism to extract value out of human labour when constrained by physical and biological limits and organized labour.