I think the point the video tries to make is that if you regulate what kinds of housing is allowed to be made you create an artificial scarcity. So even if you say "you can only build affordable single-family homes" you inadvertently create a scarcity of housing by preventing some types of housing from being made. Now when rich people want to move in they have to buy a single family home, driving up the price. I mean aren't rich people living in concrete boxes stacked on top of one another in a skyscraper better then them living in a single family home? You might never get to live in that skyscraper but at least they take up less land and pay more in taxes, both of which seem like good things to me.

I didn't know the Koch brothers partially funded the organization but it seems short-sighted to dismiss anything with funding from the Koch brothers, especially things that don't have anything to do with oil. I mean the brothers support open borders, think people should be able to freely enter the US and oppose Trump's immigration plan. Does this mean you now support Trump's immigration plan, since opposing it would put you in line with what Koch industries want? I think strong scepticism in things related to their industry is fine but zoning laws don't seem like something you spend money on unless you're just interested in what the best option for zoning is.