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Analysis examines cluster proxy extrapolation and its applicability to SLACS ETGs, suggesting the need for distinct mechanisms.
We apply the locked CDN-242 7-term cluster κ-proxy to 20 SLACS early-type galaxy lenses from CDN-331. The proxy was calibrated on galaxy clusters at eigenvalue λ ~ 17-25. SLACS ETGs sit at λ ~ 3, a 100× mass extrapolation. Result: INAPPLICABLE. The quadratic curvature term b6·(ln λ − ln 17.5)² dominates at low eigenvalues, producing κ = 1.0 for all 20 lenses — a sigmoid saturation artifact with no physical content. Neither PASS nor FAIL can be declared. R_DM remains at 0.94 (pure ν). D13 stands: the ν-to-proxy transition requires a separate galaxy-scale mechanism, not cluster-proxy extrapolation. Archive contains Art Edition PDF, computation script, build script, and results JSON.
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Nicky Joseph Hubertus Catharina Hacquier (2026) studied this question.
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