A report widely repeated in popular speech is not automatically mashhur in the technical usul sense. The textbook distinguishes mutawatir, mashhur, and khabar al-wahid by transmission-related criteria and associated legal-epistemic treatment, not mere social popularity.
A sound analysis first establishes the report's actual transmission category. Only then should it discuss the type of knowledge or duty associated with that category in the book's framework. Familiarity with a title cannot replace source investigation.