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In the YAGC framework, the stochastic spacetime update field φ(x,t) has been modeled as an Ornstein–Uhlenbeck (OU) process whose correlation structure may depend on environment and scale. Separately, previous YAGC work proposed that superconducting systems strongly reduce boundary-maintenance cost and suppress ordinary dissipative scattering events. The present paper connects these lines and asks a concrete, falsifiable question: Does a superconducting environment alter the effective OU parameters of the spacetime update field? We do not derive this possibility directly from electromagnetic constitutive parameters such as permittivity or permeability. Instead, we treat the superconducting state as a phenomenological regime in which local Σ-event density is reduced because dissipative electron-scattering processes are strongly suppressed. We posit a minimal coupling ansatz between the local Σ-event density and the OU fluctuation strength σ of φ. Under this assumption, superconducting environments should reduce the variance of φ, potentially shift its correlation time, and generate measurable differences in Allan variance, low-frequency power spectral density, and OU-fit parameters. A key result is the accumulation law SNR(T) ∝ (Δn_Σ / n_Σ,bg) √(T/τ_c), showing that long-duration operation converts a tiny coupling into a testable constraint. We identify superconducting maglev (SC-Maglev) as a uniquely valuable platform because it combines persistent superconducting operation, large system scale, precision monitoring, and spatial sweeping through motion. We define a protocol based on ON/OFF superconducting comparisons, residual extraction, PSD analysis, Allan variance, and OU model comparison, together with explicit falsification criteria. The significance of V121 is methodological rather than proclamatory. It does not claim that superconductivity has already been shown to modify spacetime. It provides a precise phenomenological hypothesis and a test protocol by which such a claim can either be supported or constrained.