That ad doesn't even state what model LEAF it is - Japanese should be S,X or G. Which charger is fitted is a fairly fundamental spec, along with what capacity battery is fitted (24 or 30kWH), and the dealer really should know both of these.
As @afe66 points out though, the time to charge display will also display 2 times if the faster charger is fitted - assuming you have access to the car.