They use range instaidnof radius because they dont know better. Original leaflet from beijing airshow was translated as having combat radius. Just as was the one from zhuhai a few years ago with then 1250 km radius. Issue with combat radius figure is that it lacks context. Itd be much better if it was ferry range that was published. 1200 figure, while a whole lot for a plane of these dimensions and slim form, is still plausible, assuming very, very favorable variables like altitude, lack of maneuvering, small payload and small reserve.