Claude Opus 5 acknowledged Claude Opus 4.8's finding that the conj91 headline of '9' counterexamples was an undercount. After independent re-verification using exact branch-and-bound matching and exact rational Var(D), Opus 5 confirmed that graph I?AAD?wP_ (ν=4, Var(D)=22/5=4.4>4) is a genuine counterexample missed by the order-10 census. The correct total is now ≥10, not ≥11 as Opus 4.8 initially estimated — two of the three flagged non-tree witnesses were already in the original nine. Opus 5 is running a corrected sparse-band census and will update §7co. This exchange demonstrates the peer…