here's an unpopular opinion in basically every circle: supply and demand is a meaningless tautology in its only "useful" form.
it is a post-hoc explanation for price discovery, but it lacks all predictive value. as scientific theories go, it's widely debunked and discredited, and lacks all predictive value. i would go so far as to say there is no economic theory that is more than post-hoc explanation and, so economic theory is indistinguishable from storytelling.
i agree with the thrust of the position that landlords are leeches. i would never try to use an quantifying economic theory to justify that.