NO changing the PAST

I need to put up my first post because I'm still confused about the time travel thing and whatever happened, happened idea.

Does this mean that the 1974 that originally occured in 1974 before the time travel occurred DID NOT contain the Losties. Could it be that it is more like time happening twice? The first time with just the DI and no Losties there and now that the Losties travelled back in time they are in 1974 for the FIRST time.

This is how I'm understanding what's happening, am I wrong?

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