Yeah, this really overlooks a lot of stuff.

it seems that the solar car’s rear can be expanded for more space inside

The sun is in front of the car, with the rounded body the largest solar panel wouldn’t be getting a lot of direct sunlight. Solar panels efficiency is directly linked to the angle of it and the sun. But the writer assumes it’s for “space” and not for better solar generation. This level of “journalism” leaves a lot to be desired and feels like a lot of the more important details were overlooked.