Honesty relates not to how things actually are, but to the extent to which what we communicate corresponds to what we actually believe.
Even if my beliefs about things are are objectively skewed and invalid, if I communicate my skewed beliefs to others, I am being honest. In fact, if, when asked, I communicate, not my skewed beliefs, but the objectively valid truth in which I do not believe, I am being dishonest.
In short, honesty is a quality of a subjective relation, not an objective one. It pertains to the extent to which I say what I believe.