It doesn't _absolutely_ disincentivize these things unless they are operating at a loss. It certainly disincentivizes "economic activity" like opening an at-grade parking lot in a bustling city-center in order to minimize the property tax you pay while the land appreciates in value more than it disincentivizes opening a parking garage there (assuming there's actually enough parking demand to pay to build and maintain).

(I don't entirely disagree with you--it seems like this would shunt some investment away from investments that need expensive land. It's less clear to me whether that is good, neutral, or bad.)

George goes to great lengths to distinguish these factors of production. They are fundamentally different.