I don't think this article makes a logical argument at all. It says house ownership is bad because it gives people a vested interest in constraining the supply of housing. That's true but that's not a problem. If people didn't own houses then someone would, and that someone is still incentivized to constrain the supply. I'm also not sure that reducing home ownership is a good idea - "let's make everyone poorer" doesn…
Higher density has pros and cons. Living in higher density areas can increase quality of life significantly, if you can walk to work, groceries, pharmacy, restaurants, friends, etc. See https://www.theguardian.com/world/2020/feb/07/paris-mayor-un... for example.
Obviously the extremes (1 bedroom skyscraper flats and living 1h away from civilization) won't work for most, but there is a spectrum where people will choose different things depending on their individual preferences.