I think that some kind of misinformation has been orchestrated by Others to stop the outside world's look for Losties, but faking a whole crash sounds way off to me too. If Naomi can speak 4-5 languages with blood in her lungs, she sure can be lying even at that moment- but possible that her comment just points to the general misinformation regarding Oceanic 815.

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"Bear...? Is that you?"-- Hurley S03E4