The author compares parking structures to holes in bare soil, caves and/or house basements which have very little concrete between the house foundation and the

The author compares parking structures to holes in bare soil, caves and/or house basements which have very little concrete between the house foundation and the soil. Is it appropriate to compare these underground environments with a underground parking structure which has much more concrete insulation? I also think most of the heat the cars bring into the garage comes from heat radiating off the engine block and not heat that was absorbed from a hot road.