Where is the new DNC throwing weapon?

[Rongway]

But DNC's animation clearly involves movement with projectiles that only really make sense if they are shaped in a way that can "logically" return to the thrower. At most maybe they could make them boomerangs, but with like knives it would seem like DNC is psychic magic.

They are. All jobs use magic to do their thing, even the Disciples of War, Land, and Hand.