Hmmm...good point Island Man. The Greek does mention, "they didn't know"
I don't know Greek, and wouldn't be in any position to argue how those Greek word's should be understood. The thought in 2 Pet 2:5 , in the Greek, does claim that Noah was a "Preacher". Heb. 11:5 says that, "Noah condemed the world" (Byington translation). The Greek says, "though which faith he judged down the world".