It was my claim, not the person you're responding to now. As to why I "just know": it's because I'm not a robot, I have experience at reading this kind of clai

It was my claim, not the person you're responding to now. As to why I "just know": it's because I'm not a robot, I have experience at reading this kind of claims, and they usually mean what I think they mean. "You just know" is an idiomatic expression, it's not meant to be dissected.