As I suspected and why I said citation needed, you went on an irrelevant tangent into tenancy law. How does that link negate anything I said? If I had said “I could force you to leave my home immediately”, yes, that link would sorta apply, but I didn’t (evicting you via the courts is “force you to leave”). The conversation is specifically around your right to privacy when staying at property you don’t own. Yes, fourth amendment would prevent the property owner from letting police in under many (but not all) circumstances, but there is virtually no law preventing them from “violating your privacy” entering at their will. The laws that do apply generally only dictate notice periods, and even in those cases they have exceptions for emergencies, which ensuring security when they feel there is a credible risk qualifies.

Again, shady as hell ethically what they did and how they did it, but still very legal.