its not really a secret movie if you tell everyone about it
It's still secret if you can't obtain it just by playing through but have to meet certain conditions and/or if the criteria for receiving it aren't revealed.
Though I guess the term secret is used rather liberately with KH, which is okay for me. I rememember many people calling 0.2's ending a secret ending although everyone got it by simply playing through the game and waiting for the credits to run through.
That interview part about the True Organization is indeed rather confusing and doesn't answer anything and only serves to create more questions. It could be uwed to answer why Xigbar changed this drastically from his BBS appearance to his current one, though time travel is also a possibility.
Though I would still question why it would be a necessity to turn them into Nobodies again. Might have something to do with this darkness against light thing since I don't believe most members of either faction fit the initial description of how the X-Blade was split.
Eh. I don't really want to put too much effort into theories somehow because the game is this close to release and things might get retconned anyway.
But thanks for translating it! It's always great to read these types of things, althought it might make things more confusing. But that seems to be what Nomura likes to do anyway.