I've heard it, but don't necessarily believe it.
When you look at tailplane incidence, it might indeed appear positive. Add to that the downwash from the mainplane, it might then become negative.
Look at the tail/stabilizer of almost any jet airliner. The side with the most curvature is always the underside.
Look at a Cherokees' all moving tailplane. Note the incidence at full down vs full up. That should tell you a lot about where the lift vs weight moment is.