S H₀ ES (Supernovae and H₀ for the Equation of State of dark energy) 2016–2022 HVI data for classical Cepheids in the keystone galaxy NGC 4258 yield doubly discordant Wesenheit Leavitt functions: W₀, ₇-ₕ₈=-0m. 13 0m. 02 (-0m. 17 unweighted) and that is paired with the previously noted W₀, ₈-ₕ₈-0m. 3, which in concert with complimentary evidence suggest the 2016 S H₀ ES NGC 4258-anchored H₀₇_₀ warrants scrutiny (i. e. , ₇_₀/H₀ 6\%). Cepheid distance uncertainties are further exacerbated by extinction law ambiguities endemic to such Leavitt relations (e. g. , NGC 4258), particularly for comparatively obscured variables (e. g. , d 4\%, reddened Cepheid subsamples in the Milky Way, M 31, NGC 2442, NGC 4424, NGC 5643, NGC 7250). Lastly, during the analysis it was identified that the 2022 S H₀ ES database relays incorrect SMC Cepheid photometry.
D. Majaess (Mon,) studied this question.