This paper proves a precise law-level equivalence between two structures that have previously appeared independently in the Tier-0 framework: Record silence: The absence of any nontrivial persistent record in a canonical record channel, defined via stationary survival under collapse filtering; Pure Flow: Resonance-free closure dynamics, defined by asymptotic closure periodicity without anchor capture. The main result, the Record–Flow Duality Theorem, shows that these are not merely correlated notions but are exactly the same structural property when expressed in a common admissible container: An object is record-silent if and only if it lies in the pure Flow sector of closure dynamics. The proof is non-dynamical and non-stochastic. On the closure side, objects are classified by asymptotic closure periodicity and a resonance invariant measuring compatibility with container symmetry. On the record side, record formation is modeled canonically as stationary survival under an irreversible contraction, with record-silence defined as the absence of any nontrivial stationary component. Under a minimal and explicit interface assumption finite cyclic symmetry of the record quotient induced by a single closure step, the paper proves that these two classifications coincide exactly. As a consequence, record-silent sectors are identified as the necessary traversal (Flow) sector required by lawful closure. This result closes a foundational gap left open by earlier work, including the Φ-Void theorem, which established that Flow must exist but did not identify its manifestation in record-forming channels. The paper is not a proposal of new physical dynamics, particles, or interpretations. It is a law-level classification and admissibility result. Its role is to determine when and why nontrivial lawful structure must include a non-depositing sector, independent of implementation details. Interpretation consequences are recorded not asserted including: dark matter as a Flow-dominant curvature sector in ordinary record channels, light as a canonical Flow probe that induces records without becoming one, computation as Flow traversal, with memory corresponding to anchor deposition. These are presented strictly as structural projections of the duality, not as replacements for domain-specific theories. The result is invariant under admissible changes of representation and blocks trivial reparameterizations that would otherwise make Flow classification vacuous.