There is a key premise in this article. That premise is there is some unadulterated Will of the People that democracy is meant to uncover, and the Capitalists are subverting it.

To me the flaws in that premise seem pretty straightfoward - there is no truth that democracy seeks to uncover. Democracy is a highly effective release valve so that if the situation becomes intolerable then the ruling class is changed out. If you want to change the world, you need to convince the ruling class that change is needed, or the people that something else needs to be tried.

The idea that some people have more decision making power than others isn't some subversive perversion of what is good in the world, it is normal. Democracy is fantastic compared to a monarchy - the competition is systems where a lunatic ruler can appoint a horse to government. That is a pretty simple example of why democracy should be preferred.

Capitalism and Democracy are bedfellows because they are both the best systems we know of for filling roles that need to be filled - how to allocate resources and who gets to be in charge respectively. The problem isn't that the wealthy are also powerful, the problem is that the people are as disorganised and fractured in opinion as the politicians who represent them.