I believe the "long ranged" in this case is only used as a unit type. Meaning certain attack/defense bonuses of other units will apply to it.
There's a Steinling unit on the map who is "long ranged" and only has a range of 4. Other "long range" units such as the Mortar unit actually have 14 range. Basically what I'm trying to say is I think the range is correct, it's the name of the unit type that is misleading.