OyYou, the sign in your cockpit is in accordance with the TCDS, which I copy here. Your empty CoG obviously falls between -4.4 and +0.5
Empty Weight C.G. Range
(-1.5) to (+0.5) solo from either seat
(-4.4) to (+0.5) placard in front cockpit: "Solo from rear seat only."When empty weight C.G. falls within this range, computation of critical fore and aft C.G. positions is unnecessary. Ranges are not valid for non-standard arrangement or for crop duster or sprayer installations.