[@Kouki]

Do note the description of the semblance. 

[quote=Write](Working title) Problèmes D’aujourd’hui: Noël once fully enveloping an object in her aura is able to make [b]replications and considerable amounts of them at that[/b]. However, she may also utilize dust in place of her aura to [b]replicate[/b] objects. Most commonly she uses her dust arrows, mid-flight or otherwise.[/quote]

They are replications, not decoys. Also she can only do this to inanimate objects. She can essentially create a clone of an object if it is imbued with dust or she can envelop it in her aura.