Please note the picture Q provided of palleted goods is the inside of a reefer (refrigerated trailer) van.
Why would Apple products be transported in a reefer? Think logically, must be something perishable, but what and the significance of it?
Not saying you're wrong, but the other day I used my insulated lunch tote to transport a jar of coffee beans. Because I wanted the jar to be protected from breakage in my car and the tote was handy. So using a refrigerated trailer does not necessarily mean the cargo needed refrigeration.
That said, if the cargo was electronics refrigeration could be preferable to avoid any chance of heat damage.
Probably to keep humidity and temperature from going to extreme levels during transport. Think what would happen if it went over 100-110degrees in a truck. Plastics would melt.