Why the Nest infantery are not destroy by AirStrikers

In the description at arsenal the Airstrike  - quick air strike to bring down structures, and the Nest infantery description - light infantery nest specialist agains infantery .

So my ? is why airstrike vehicules cant atack nest infantery, 

and in arsenal the nest infantery it is in the Buildings Defence = structures, 

and the ? why cant atack nest with airbombers