I probably shouldn’t have underlined “always”. I was focused on real airplanes and forgot that R/C hot dogs often fly models that are neutral or even unstable longitudinally. You are correct in that if the cg is moved aft to the neutral point, the airplane will simply go where it’s pointed either upright or inverted. To fly level, there still must be a positive deck angle for the wing to develop enough lift to balance the weight. In the case of a neutrally stable model, this attitude need only be set momentarily and it will remain there hands off unless upset by a gust or something. It’s not quite accurate to say that the airplane is “in-trim” since a neutrally stable machine in effect doesn’t have a trim speed. That’s why it behaves like it does.

I will revise my statement. “If an aircraft with a symmetrical airfoil with a zero zero incidence setup has positive longitudinal stability, it will always require up elevator to fly level and down elevator to fly level inverted.”