This article is clearly about Geoism; its traditional interpretation. In its essence, Geoism should be about rents, not about land specifically. Of course they couldn't have known about tech platform monopolies back then, but they are very much about rent extraction and a far greater concern than land is nowadays. I feel like such articles are a distraction and would lead to even bigger problems. Essentially prepping to dispossess middle class land owners who are the last bastion of decentralization.
It's absurd in this day and age to be discussing land rent-seeking when the cause of most of our modern problems is platform rent-seeking. Frustrating how people twist everything good into something bad; of course there was no talk of Geoism when land rents were the main problem and main mechanism of rent extraction; only now that elites have found a different way to extract rents, now it's OK to discuss the (now) lesser evil of land rent-seeking and distract away from the new variant of the problem.
You're dramatically underestimating land rent, probably well over $10t/year, total land value over $200t.
Its Georgism, after Henry George