This chapter is extremely important. Not for the plot, oh god no! It's because it provides further proof, on the first page, that Reiji isn't planning shit! His foresight into his own story is, maybe, two arcs into the future with a vague sense of what the end looks like. Probably not even that, I bet he goes arc by arc. How else would he fit ChatGPT in a story that started years ago?
Now, I'm going to admit that this argument is ridiculous, you can sneak in cameos and stuff even in rigorously planned out stories. But this isn't a well written story, this is Kanokari.