Not really stated in the article are three caveats: 1) Zoning laws have to change as well to actually allow development of the land being taxed toward more productive ends. 2) The land tax amount needs to be high enough that the pain of the tax effectively forces owners to improve what's on the land. A homeowner sitting on a million dollar piece of property in California taxed at ~1% is still unlikely to build an apa…
The author likely isn't aware of that. If the author made that argument then it would undermine their argument about affecting people's choices minimally or not at all.