it's just the yet missing [Completed] tag, which the thread had once, when the game was announced "finally version 1.0, complete! ...but..." by the devs.. which (the tag) at that time triggered quite a stir and then got removed again, i think because the game is still getting updates, so by tag regulations it can be considered as
"hmmm so devs say it's final but if they still keep updating it can't be complete, right?
..right?"
see there is the snag. we keep getting updates which by themself don't do a thing to the main game. so it can be considered finished. on the other hand, the epilogue (at some point referred to as book 5, which isn't really a full book 5) is still being worked on, with content added and could be seen as part of the game.
would Marty declare all of the epilogue being some kind of "Extras pack" like some other games have, different story, tag FET as done, and have the extras. but here we go again, and Marty still does plan to work on some things he wanted to work on, all along, for years. example, even while they worked on book 3 he already mentioned wanting a redo on book 1 some day. so there's no extras, "the game" still being worked on.. somehow a snake biting it's tail.
if the staff tags this one as [Completed] just lean back and have popcorn, the "yeabutt" will pop out all over the place. if they don't put the tag, the "why?!" has the upper hand. either way, popcorn proves useful.