Ok, so I've listened to the song a good amount of times now. I still love it in general. The string arrangement is chefs kiss with some really nice cello sections and even violin trills, which as far as I can remember are a rarity in Kajiura arrangements. I also really appreciate the real harp here (I'm 99% sure it's not synth). Also, I actually have no issues with the key change, also because the keys are closely related to each other (full tone up and then down), so I don't find it jarring at all actually. But then again, I've been listening to a lot of classical music in the past with my parents, including to stuff like Wagner where sometimes the key changes every couple of bars...
However, I agree with the "false end" and restart issue. Kajiura kind of likes to throw in stuff like that. Maybe tomorrow specifically comes to mind here, but also nocturne sounds like it could've almost ended in several places if I remember it correctly. So I'm kind of used to it and therefore I wasn't too surprised that she pulled a move like that. However, the problem is, that the "false end" sounds too final here. The fact that the following section then starts identically to the beginning of the song doesn't help either, since it really does sound like the song just repeats from the beginning. She could've just played some extra filler notes on the piano there and I think that would've already helped the issue quite a bit. But most importantly, the false end should've been shorter and less drawn out. The way the song is now, it just isn't really connected there.
Otherwise, I really don't have any issues with the song. It's super soothing, relaxing and a treat to the ears.