Yes, I can confirm Unabara said "25 percent" when asked about completion.
Since Tasofro is a small team that can't divide themselves on multiple games the way huge developers can, the real production of AoCF probably began almost immediately after they wrapped up ULiL PS4 (they started the project before that, according to a Strange Creators interview). Which means it took them less than 5 months to reach 25%. And the remaining tasks don't have to take the same amount of time to complete. Still...
I don't think they can make it to Autumn Reitaisai.
EDIT: And this means for the purpose of the non-game media, either AoCF will have to take place after HSiFS, or they will have to dodge the topic of what transpired in AoCF.