It isn't. The ultra captain and other areas are the areas locked behind the expansions. The recent bugged PS4 video revealed the expansions as being coded into the game already, in areas that are fully designed and accessible (via glitching ), but are blocked off from typical exploration until you pay for the 9.5 MB unlock key. Again, the important thing to note is the tiny size of the expansion downloads. They're only the size of a few assets, like trees maybe, no where near enough to be the download for entire raids, strikes and stories. This is because all of that is already on the disc, they're just selling you the unlock keys, effectively making you buy something you already bought.