Range is given as 160km or 86nm. But of course in general-public stories they never distinguish between absolute range and range-with-reserves. Reserves will be an issue as certification of ePlanes ramps up.
Nonetheless there are "enough" places in the world where that is a reasonable range. Only about 50nm between the site of this test flight and Victoria Harbour. Which would require ~25 minutes in this aircraft - but 180 minutes by car and ferry.
Similar for San Juan - St. Thomas or San Juan - Vieques. Not to mention the famed "shortest commercial flight in the world." Westray to Papa Westray - 53 to 90
seconds 
Also, BTW - for test purposes the battery is lead/acid. There are lighter batteries planned.