That's is exactly what this is about. If you buy the new Call Of Duty when it first comes out. You better believe that the first DLC isn't just planned but is already made. Just look at pre-order maps. The only difference between that situation and this one is we can't see those maps so we don't get mad about it. But none the less that are already made, just like the places in Destiny.
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People aren't expecting the DLC to be ready to go. Because of the disjointed and incredibly brief main campaign, plus general lack of content, that the DLC was unfinished main game launch day content that was repackaged.