You are not technically wrong that our modern technology has made it possible for land to be capital, like when you dredged the sea floor to build an island, but is a tiny, insignificant portion of all the land. If you are under the impression someone needs a lesson in economics, what are the chances that they are going to think you are talking about some man-made island in Dubai rather than the natural ground that makes up the vast, vast, vast, vast majority of earth? For that explanation to land the audience would, in most cases, need an even deeper understanding of economics than the level you were trying to present.

Isn't Elon Musk's main function in society court jester — to make a fool of himself for our entertainment? That is what he does in my timeline. Perhaps we exist in different universes.