Yeah, that’s generated by Apple Intelligence. Devices that don’t support Apple Intelligence still show the same UI as iOS 26. I reported this change back when iOS 27 beta 1 was released.
I also have a custom animated wallpaper that I enabled using Nugget, and it’s still working to this day. I assumed it was restored through an iTunes/Finder backup. I didn’t realize iCloud backups might preserve those kinds of modifications as well.