Real life example, factory worker productivity rose dramatically with automation, and salaries did not keep up. Physician productivity did not increase much but salaries grew.
This article is trying to argue something else entirely. That we as a society are collectively screwing those less fortunate. The productivity has gone up, and the gains from the productivity go to the rich rather than the poor. While this might be true in principle, this article fails to provide the evidence, as the entire premise is flawed.
Wages are set by the market, not by productivity.
Right... but there's absolutely no mechanism to achieve anything apart from through the market (for the private sector.) You can argue all you want, but nothing will happen. Nobody (to an approximation) is going to voluntarily pay more for an abstract concept of fairness.