That isn't at all what they said in the interview. They specifically said they wouldn't be able to fit the whole game into a single release because of the level by which they want to increase the quality of the content. They want to add vast amounts of detail that basically guarantees that development will be long, hellish, and will force the backlash on consumers, forcing them to deal with their game coming in pieces.
They have already essentially confirmed that you won't be able to go from the opening sequence to the final Sephiroth battle in the initial release. They have split a full game into episodes. It is episodic, much like Life is Strange, just with longer pieces.
It means instead of concluding in one entry, multiple entries are being considered in development. Each entry will have its own unique story. As a gaming experience, each entry will have the volume of content equal to a full-sized game.