lvl 20 guildleave "Mortal Munchies" says: A supply party has come under imp attack and its precious cargo of food stolen.

lvl 11 fate "Now I See Bees I Won" says: Honey-seeking imps are killing off peaceful bees, and if the malevolent monsters are not stopped soon, honey production in the Twelveswood could suffer a serious blow.

It is not like it has been particularly denied that voidsent can eat. It simply seems to be no common knowledge among Eorzeans.