Kināyah conveys an intended meaning through an associated expression; taʿrīḍ can communicate a point indirectly without explicit naming. Both require the interpreter to move from the surface wording to the meaning signaled by context.
Audience, occasion, and established usage matter particularly here. It is unsafe to treat every conceivable hint as certain authorial intention.
In ordinary speech, “the doors of this house are open” may describe physical doors or signal hospitality. Context decides. Only the surrounding context distinguishes a literal observation from an indirect indication of hospitality.