Compare your ability to the swarm attack, or some other thing that uses this tag - what's different? Is there some other tag the swarm attack uses to control its display in the UI?
Check if melee attacks would have their attack roll hidden - this may be limited in its application, since it was only designed for swarm attacks, which are melee attacks, and not normally something someone will print out - people print out their own characters, but for monsters, they print out the statblocks.
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