We present fully converged MCMC constraints on the Stratoverso cosmological model, a scalar-field extension of ΛCDM featuring a late-time kinetic transition that modifies the cosmic expansion only at z 2σ, confirming a statistically significant preference for conformal resets over ΛCDM. A dedicated MCMC run of the w₀wₐCDM model on the identical dataset gives a comparable χ²ₘin (2422. 20, Δχ² = −75. 3) with only 2 extra parameters (ΔAIC = −71. 3), showing that both models capture the same late-time signature, primarily driven by DESI DR2 BAO. The Stratoverso framework additionally predicts, from the same background-plus-CMB fit and without directly fitting weak-lensing data, S₈ = 0. 792 ± 0. 033, consistent with KiDS-1000 and DES Year-3 weak lensing measurements. Neither model fully resolves the Hubble tension with local SH0ES measurements. Supplementary material, including the corrected CLASS code, Cobaya configuration files, and full convergence diagnostics, is provided. Note: The predicted late-time transition (phantom crossing at z = 0. 5) has been independently verified to be statistically preferred by Planck, DESI, and DES-Y5 data at over 5-sigma in minimally modified gravity frameworks (see Ladeira et al. 2026, Phys. Rev. D 113, 083503, arXiv: 2601. 02077). Version 5 note: This version corrects the previous release, which contained inconsistent statistical figures not fully traceable to the calculations reported in the manuscript (an incorrectly computed ΔAIC penalty, an internal inconsistency in the treatment of the S₈ prediction, and DIC/best-fit figures not matching the analysis presented in the text). All statistics quoted above have been independently recomputed from the values stated in the manuscript and are internally consistent with Tables 1–4 therein.
Fabio Berti (Fri,) studied this question.