Hawking Radiation Is an Exterior Result - A Short Interpretive No-Go on Interior Ontology

Hawking radiation is a result about exterior observables. The standard derivation relates an initial vacuum state to late-time exterior particle content through quantum field modes on a collapsing black-hole spacetime. Its measurable outputs are the thermal flux detected at future infinity and the corresponding decrease of the black hole's asymptotic mass. This note states a narrow interpretive no-go result: the Hawking derivation does not, by itself, license an interior ontology. It does not establish what an infalling observer experiences, what localized field configuration exists behind the horizon, or whether a negative-energy particle literally falls inward and reduces the black hole's mass. Those are additional interpretive or theoretical claims. The exterior calculation licenses exterior radiation and exterior mass loss. It does not license interior narration. The paper proves five propositions: (1) the standard Hawking derivation is exterior-asymptotic in its operative content, requiring no independently specified interior particle history; (2) ADM mass loss is an exterior statement about the asymptotic geometry, not an interior narrative about a localized internal mechanism; (3) the common claim that a negative-energy particle falls into the black hole is not established as literal interior ontology — it is a heuristic device for representing energy conservation in the pair-creation picture; (4) interior experience is not determined by exterior flux, since particle content is observer-relative and an infalling observer crossing the horizon detects locally regular vacuum, not the thermal flux registered at infinity; (5) any determinate interior ontology requires additional theoretical commitments beyond the exterior derivation itself. The claim is conservative. It does not deny that black-hole interiors exist, that semiclassical gravity holds, or that future theories may describe the interior. It does not solve the black-hole information problem and does not decide between complementarity, firewall proposals, holographic reconstruction, or entanglement-based interior proposals. Its point is narrower and prior: the standard Hawking derivation itself does not supply the interior ontology that those debates contest. The persistence of those disputes reflects the limited scope of the original result. The black hole loses mass as measured from the exterior. The standard Hawking derivation does not convert that exterior fact into an interior particle story. Exterior radiation and exterior mass loss do not license interior narration. This is a short interpretive note (5 pages) intended for readers in foundations of physics, quantum field theory in curved spacetime, black-hole thermodynamics, and philosophy of physics.