This is a sloppy essay - it reads like the first draft of an idea. The facts he cites are all true, but a lot of his conclusions are ... sloppy. But it feels like a stream of consciousness, a devil's advocate argument with himself, and it has a pretty good conclusion. I think most of the confusion comes from people who say "zoning" to mean "structural restrictions on growth in the housing supply", while he enumerates those structural restrictions.

Worth a read.