That post is riddled with inaccuracies. Taking from the very rich, according to democratic norms and the rule of law, and using it to subsidize the lower and middle classes has resulted in profound and positive economic growth. We've seen this work again and again and again, all throughout Western history.
You don't need to close the pay gap. Income inequality is a good thing within certain parameters. All you need to do is increase socioeconomic mobility, knock off the worst of the excess, and remove or negate as many individual "birth lottery" advantages as possible (i.e. a kid in Compton should have the same net opportunity as a kid in a rich suburb).
Beyond that, it's actually insane for you to talk about "authoritarian regimes" when we have very quickly moved towards economic fascism, for the benefit of the oligarchy. As if people exercising their democratic rights in order to benefit the mob is actually more authoritarian than the system we currently have. It's totally delusional, and a prime example of the double-think that dominates economic debate these days.
In the end, Medius, we could present a hundred different proposals, and you'd reject all of them. It is a foregone conclusion.