We prove, conditional on TCC being the correct Planck-scale description of spacetime, that no cascade-based finite-time singularity occurs in the Navier-Stokes equations in physical spacetime. The turbulent energy cascade is SRNUDT remainder propagation. The Planck floor is the terminal object of CSRNUDT. The SRNUDT Boundary Theorem (Ploof 2026, Paper A, DOI: 10. 5281/zenodo. 19326496) establishes that remainder localizes to the compact-K-invariant Planck-floor boundary rather than accumulating at interior points. Cascade-based finite-time blowup requires remainder to concentrate at an interior point approaching zero scale; the Boundary Theorem, applied via the maximal compact subgroup K = SO (3) of SO (3, 1), forbids this within TCC spacetime. In cascade-type blowup, vorticity satisfies ||omega (t) ||Linf ~ uₗambda/lambda (t) ; since lambda (t) >= lP > 0 for all t in TCC, the Beale-Kato-Majda criterion cannot be satisfied. We further argue that the Clay Millennium Prize formulation presupposes the Continuous Spacetime Axiom (CSA) - a physically unjustified premise at singularity-formation scales - and that the physical and abstract-mathematical NS regularity questions are distinct. The physical question has a clean conditional answer: global regularity holds in TCC spacetime for all cascade-based blowup scenarios. Non-cascade blowup mechanisms (Type I) in TCC spacetime remain an open question.
Bradley Ploof (Sat,) studied this question.