I think he was just trying to say that... well, you got MANY posts, right, and some of them are just... well... These kind of one-liners, like "Good work, keep it up!". There's nothing bad about that, uhm, but it does not tell something about your experience. He wanted to make clear that you can't look at the number of posts and know how experienced a person is. That's no offend, Cowabanga.