Abstract The null result of the Michelson-Morley experiment has long been interpreted as evidence against a substantive spacetime medium (Ether). However, recent experimental breakthroughs in Anti-Parity-Time (APT) Symmetry (Li et al., 2019) have demonstrated that diffusive systems—such as heat transfer in moving media—can exhibit "motionless profiles" that remain stationary relative to an observer despite the convective flow of the background. The Deus Cosmological Model postulates that the vacuum is a viscoelastic superfluid operating under these exact non-Hermitian principles. We propose that massive baryonic bodies induce a local APT Phase Transition in the vacuum, creating a symmetry-protected "Entrained Bubble" (RD) where the relative velocity of the superfluid drops to zero. This framework mathematically resolves the Ether Paradox without discarding the physical medium and predicts that superluminal propulsion is achievable by controllably breaking this symmetry to induce negative transport (Supercavitation). Keywords: Anti-Parity-Time Symmetry; APT Symmetry; Non-Hermitian Physics; Diffusive Transport; Viscoelastic Superfluid; Superfluid Vacuum Theory; Hydrodynamic Gravity; Entrainment; Motionless Profiles; Convective Flow Control; Symmetry Breaking; Phase Transitions; Negative Transport; Supercavitation; Ether Drift; Michelson-Morley Resolution; Deus Cosmological Model; Time-Domain Dynamics; Quantum Hydrodynamics