Drones attacking rats that agro the player and drone assist are two different things. Drone assist is when you assign drones to a drone bunny, and then those drones attack whatever the player is shooting at.
Moreover, as Zhalyd pointed out, drones are no longer automatically attacking what players shoot at. You actually have to press F to engage them.
I interpreted the dev post to mean that CCP was only getting rid of drones auto attacking NPC’s that aggrod the player, and not drones focusing fire on what the player was shooting at nor drone assist.