Pretty interesting argument that without some way to punish landhoarding, the relaxing of zoning laws isn't enough to make housing affordable. Also, a land value tax seems like a great way to directly counter NIMBY accusations that upzoning is just a way for landlords to profit more.
The best way to punish land hoarding is to make more land available. The best way to do that is to create the infrastructure to connect areas currently too far from cities for working people to live there to make them viable options. This defacto creates more land. People squabble over rent vs own and minimum lot sizes and bans on high density and parking space requirements etc. But this is the actual answer. This is why cities like NYC, London, San Fran etc are so popular in the first place: you can live in a house with a garden, you can work one of millions of jobs and you can get to and from those 2 places in 45min even if you're tired or drunk.