I think (hope) they were referring to Niang's 3-point shooting over the past 3 games (he's gone 0/15).
Still, big deal. He's in a bit of a shooting slump behind the arc, which happens to virtually every single player regardless of their talent. The next time he drains 2-3, everyone will forget all about it.
I'll let Fred do the coaching if he thinks this is a problem.
Slumps are rough...a few of his looks were great shots. Feet under him, ball just didn't go in. Have to shoot your way out of a slump.