Well consider this:

If Naomi believes she is telling the truth maybe she has been convinced by who ever sent her that 815 crashed and no survivors. In other words the info she has may have been part of a briefing she was given, ya know shown fake pics or movies of wreckage. So maybe she didn't see it on the 6 o'clock news or anything like that.

So what I am saying is that we don't have to necessarily jump to the conclusion that the whole world has been conned or there are alternate dimensions. Naomi could just be a patsy. Or she could just be plain lying.

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?