iirc shadow zone was like MP3 or something in those corestream archives. I looked at it some time ago but gave up because it was just too annoying to sort out. Don’t recall seeing wwise stuff though.
It's "playable" if renamed to .at9, but it's all silence as far as I can see. It looks 100% standard ATRAC9 with repeated silent frames, don't think it's a bug. Why they needed 15MB of silence I have no clue.