Well, this is an odd discussion....
Fiction writing isn't lying for the simple reason that the writer is not the storyteller. Sometimes (in the case of first person) it's a narrator, but most often (in the case of third person limited), the protagonist is telling the story. Now, the storyteller could be a liar, and every storyteller lies sometimes, but the fiction writer Is only acting as a conduit for the storyteller, and the privilege of conveying the story comes at the cost of losing the ability to directly lie to the audience.