I a bit dont understand what mean fake true/false here.
Fake = false means that the projectile does damage. Fake = true means it's just a rock that disintegrates on hitting something.
When you fire a Flak, you notice that it makes a thudding sound when several of the rocks impact with the ship but no damage occurs? That's the fake projectiles.
Defense Drones can't tell the difference between the real shots and the fake ones so that's why the Flak I can sometimes still do 3 points of damage despite the drone logically being able to shoot down at least 1 rock.