
An implied statement, especially from an NPC who does not know everything can be wrong in FFXIV. The lore team has stated that they will deliberately misinform players through NPC dialogue and even monster names to give Eorzea the feeling that not everyone knows the answers, especially NPCs. In which this case, he doesn't know the nature and origins of the Fairies. There's even cases of monster names being changed because a regular Lominsan wouldn't know about Allagan technology so they just assume Leviathan drowned (temptered) someone.