Superconductivity — zero resistance, perfect diamagnetism, and macroscopic quantum coherence — is one of the most central unsolved mysteries of condensed matter physics. BCS theory explains conventional superconductivity through electron-phonon coupling but fails to explain why Cooper pairs can condense into a single macroscopic quantum state without resistance. This paper provides a fundamentally different physical explanation for superconductivity within the framework of the Huaxia Spacetime Total Conservation Theory: the superconducting state is a solidification phase transition of the spatial medium on local scales. Electrons are spiral dislocation loops in the spatial medium, phonons are spatial density waves, and Cooper pairs are stable configurations of two dislocation loops locked by spatial elastic coupling. When the spatial elastic coupling energy exceeds thermal motion energy, the spatial medium enters the solidification state — shear elastic modulus drops to zero, electrons move without friction, magnetic fields are expelled, and all electron pairs condense into a single macroscopic quantum state. In this revised version, we strictly derive the corrected superconducting critical temperature formula from the H-SET axioms using the Ginzburg-Landau free energy functional and the universality class of the spatial solidification phase transition determined by functional renormalization group analysis, eliminating the need for empirical calibration constants. The corrected formula is dimensionally strictly self-consistent, with predictions for conventional superconductors deviating from experimental values within five percent. Based on this physical mechanism, we further explain phenomena such as conventional superconductors, insulator-to-superconductor transitions, and why copper and silver do not superconduct, and propose several possible pathways to room-temperature superconductivity.