The Dev sees his funding platforms shutting him down, and has no idea how long he can continue - so he pulls together everything he has at that point, tries to present it as a coherent update, releases it, and hopes for the best . . . I can't be the only person here that's bright enough to realize this from the dramatic change to the writing, pacing, and artwork for the abrupt end of the last update.
The creative process for a project like this isn't "linear" for many of the Dev's that produce AVNs / games - While I'm sure that most of them have a rough outline for a guide, they may plan some key events and start some preliminary scene or character art for that, then take a break from those tasks to write some initial dialogue that was inspired by the work, then back to more art assets. They may start with the last chapter event first, simply because they feel it sets the "tone" for what they are trying to create. Gradually they polish, edit, and complete remaining tasks until they decide they're ready to release. Many of the Dev's that choose to engage with F95 describe a similar process.
TL/DR - The Dev did what he could, while he still could do it AND release it.
