It seems the writer of that article doesn't even know the difference between kW and kWh
I don't think anyone is saying the solar panels will output enough kW to run the motor directly.
However, if a vehicle has a large enough collection area (and my 7.5m long x 2m wide motorhome will have significant collection area, and the lightspeed seems to have significant solar panel surface area also) then all that energy can be collected during the day and saved to batteries. End result is actually significant kWh per day direct from the sun - certainly enough for my local driving habits.
I don't see any downsides to this - my emergency backup will be, shock horror, plugging in and charging - like any other electric car does...