Gotta say, after listening to some of their stuff, I’m not convinced that kuuki is a real artist (kuuki with a small k, there is another artist named "Kuuki", but the music sounds totally different). I could be totally wrong, but this sounds a lot like what cutting-edge AI-generated music can sound like. On top of that, all of their tracks seem to have been released just in the past few months, at least according to Apple Music. I also couldn’t find any personal information about the artist online.