This article argues that in regulated financial services, true data lineage cannot be retrofitted through catalogues or metadata overlays. Regulators require temporal lineage: proof of what was known, when it was known, and how it changed. By preserving audit-grade temporal truth at the Bronze layer, lineage becomes an inherent property of the data rather than a post-hoc reconstruction. The article explains why traditional lineage tools often create false confidence and why temporal fidelity is the only regulator-defensible foundation for lineage.