Bullets basically bring down planes only when the weight of lead fired exceeds their maximum takeoff weight.
https://weird.autos/@rootwyrm/115344211838414586
The shooting down thing seems to have been introduced in translation.
The actual law is aimed at setting up a joint unit to enable the civilian police (with no drone interdiction capabilities) to liaise more closely with the military (that has drone interdiction stuff), which they legally may not at the moment.
The big question for Germans is whether this result of the #RussiaUkraineWar is taking Germany back to a pre-WW2 rôle for the #Bundeswehr.