P76: Extremal Horizons in CCEGA Are Singularity-Free — Gₑff (ρ) Suppresses the Axion-Like Horizon Singularity of Horowitz et al. (2026)

Horowitz, Kolanowski, Remmen & Santos (arXiv: 2605. 30411, 2026) show that axions cause extremal black holes to develop infinite tidal-force singularities on their horizons in GR. We examine whether this result applies to CCEGA black holes (M > 12 M☉), which possess horizons but have a density-dependent effective Newton constant Gₑff (ρ) = GN exp (−ρ/ρc). We argue that Gₑff (ρ) and the RS1 bulk Weyl tensor E_μν act as universal regulators: the effective radion-gauge coupling is suppressed by gₑff = g_φ·e⁻¹ at the horizon density ρₕ ~ ρc = 7. 4 ρₙuc, shifting the near-horizon scaling exponent γ away from the singular regime γ < 2. Prediction: CCEGA black holes of all masses have singularity-free extremal horizons — a universal qualitative departure from GR. The explicit computation of γ remains an open problem.