Even if producing a record supply of housing units could guarantee solving the affordability issue, actually building that much housing with viable density comes with a steep price tag. Even advocates of mass housing admit as much. If we don’t go after the land value itself, we are essentially trying to deflate a balloon by blowing on it.
I don’t know where you’re getting the idea of forcing anyone out of housing comes from. The idea is that housing should be available for everyone, and land usage should be to provide for the good of the people, since land is limited. Obviously people still need housing.
Single family housing is a pretty big leech on society though, regardless of your stance. That’s what this post is about. As well as costing more for utilities, it takes more space and creates more traffic. It isn’t a good thing.
(By the way, Proudhon is an Anarchist, not a Communist or Socialist, though they share many of the same philosophies, and I think is better.)