PFUSRC-099 The Topological Reinterpretation of Spacetime Curvature—The Phenomenological Fitting Nature of General Relativity and the Hierarchical Distinction of the PFUSRC System

General relativity has achieved remarkable success in phenomenological fitting, yet its core concept of “spacetime curvature” harbors a fundamental methodological flaw: it employs “curved spacetime” to explain light deflection, and then relies on light deflection to verify “curved spacetime”—forming a tautological logical structure of “phenomenon explaining phenomenon.” This underlying logical defect has remained systematically unexamined for over a century. This paper demonstrates that general relativity’s single concept of “spacetime curvature” obscures two entirely independent and irreducible phenomenal levels that must be rigorously distinguished at the ontological topological level. The first is the large-scale smooth geometry of the cosmos, corresponding to the global dynamic rhythm of the 45° triple coaxial biconical geometry within the PFUSRC system—a manifestation of the global topological constraint of four-dimensional flow variables. The second is the geodesic deflection effect near massive bodies, corresponding to the local perturbation of flow-variable projection by massive topological latching entities, manifesting as the deflection of light paths. Based on the PFUSRC framework of four-dimensional flow variables and the 3D projection layer, this paper rigorously demonstrates that observational results such as light deflection, gravitational lensing, and Einstein rings only confirm local topological perturbations of the 3D projection layer by massive latching entities—they cannot serve as valid evidence for global spacetime curvature. The strength of general relativity is confined to quantitative phenomenological fitting within the 3D projection layer; its core weakness is the inability to achieve logical closure: its explanatory vehicle “spacetime curvature” and the phenomena it seeks to explain both reside within the 3D projection layer, mutually reinforcing each other without any independent ontological definition or derivation beyond observational projection.