Could be. AFAIK the spinning disc meters measure kVAh at some presumed=20 power factor (usually 0.8 i think). Modern electronic meters are likely=20 to do the same for the same reasons. The is due to cost dynamics of kVA = vs=20 kW to the utility company. In 20 to 50 years most everything will be PF=20 compensated and harmonics controlled (and much stuff forcibly = retrofitted).