It's "real" because it exists in the real world. It's naturally scarce as a result since two bodies cannot occupy the same space at the same time. There's only so much land available.
It's a completely different matter compared to imaginary artificially scarce cultural property which boils down to ownership of unique numbers. That's what's ridiculous.
That's "real" only because the government enforces it. My point was that the comment I replied to was ridiculous.