Sure sounds like the technician was referring to the 12 volt battery which is rated in AH (amp-hours). The LN1 12 volt battery is rated at 44 AH. The HV battery is 400 volts DC and is rated at approximately 21kWh new. Something is not right!!
Looking at the paperwork, it indicates "Hybrid Powertrain Control Module 2 HybridEV Battery Pack Capoacity 40.10Ah"
403Max, 224.12Min volts
259.5Ohm pack resistance.
.Still, they did not drain and charge the battery pack. I may have to go get my Kill-a-Watt and do that where I run the heater 'til it's d, e, doubba-d dead, then let it charge all the way up at the 8 amp setting (highest charge efficiency, right?). a few rounds after that, do the same thing at a nice ElectriFry America charger at the 15KW rate and see if there's a difference.
TorquePro does have the capability to report the battery capacity in kWh stored in the car's computer. I purchased my 2014 Spark EV as a used vehicle with 1500 miles on the ODO. I started using TorquePro to report the battery capacity after the car had 14k miles on the ODO. At that time the car reported a battery capacity of 17.2 kWh. In December 2021 my ODO read 30015 miles and my battery capacity was 14.3 kWh.
See if you can find someone who is using TorquePro to measure the battery capacity in their Spark EV and have them measure yours. You can also use the data displayed on the Spark EV'S Energy Information screen to get an estimate although it will be a "rough" estimate.