I sound like Miss K? What is she like?
So your rationale is, because it doesn't say anything about Noah preaching in Black and White, in the book of Genesis? Because, the book of Hebrews, and 2 Peter, both support the thought that Noah wasn't silent about God's intent at that time in history.
I'm not taking sides in your argument with Miss K. I'm just expressing an opinion on this topic. I struggle to believe in the Bible every day, and sometimes it is a challenge when there is a lack of supporting documentation, and background to fully understand the context, and meaning. I don't think that the GB, or anyone has the manopoly on Bible understanding.