O-5 - With measured Higgs and top masses the SM electroweak vacuum is metastable with lifetime vastly exceeding the age of the universe
This is the modern data-driven verdict on spontaneous electroweak vacuum decay: metastable, not unstable - the disfavored region is absolute stability (at 2 sigma), not safety. The instability scale for Mh = 125 GeV develops at 10^11+-1 GeV.
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Why this is evidence
The computed verdict is metastability — a decay channel exists but with enormous lifetime. H-31 predicts exactly this outcome; under H-42 the same inputs would have to yield absolute stability, so the observation is what H-42 says should not happen (again conditional on the SM effective-potential extrapolation holding to high scales).