Actually xcomet is correct, change the projectile so AG=yes.
Leave the building's LandTargeting= alone. This combination of projectile and building targeting will mean that the building will able to shoot at ground units - but only when they are not on the ground. Hence paratroopers are shot until they land. And ground units which attack the buildings are never fired upon. This is the desired result overall.
I will point out that there is quite a bit of projectile and warhead sharing going on between flak cannons, flak troopers, and flak tracks. And flak troopers and flak tracks need their AA projectile to be AG=no so as to prevent weapon use confusion. So before modding the flak cannon's projectile, I would suggest that the weapons used by these units be altered so as to use unique projectiles and warheads. Then everything can be modded individually without creating problems elsewhere.
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