This is pure speculation and has no basis in anything Larian has said, but I suspect they didn't say "this epilogue is a work in progress" because of timing. Think about it, you're between the game releasing on PC and console, and a significant issue among the players has come up that will take time and effort to correct. You can put a band-aid on it now that's not perfect, but it is something. You want to maximize sales before Starfield comes out, so you can't just come out and say "this game is still a work in progress despite the 1.0 tag". If you do that think of how many people will just say "I'll wait to buy it until it's finished", hell most of us are saying something similar and we already have the game. While I definitely don't appreciate the somewhat underhanded wording by the PR team, I'm not exactly surprised they didn't want to advertise the game still has some unfinished elements.
