It's still correct regarding ebooks and audio files, you're not paying for the files but the rights to keep a copy of the file and use it personally.
If the files are not protected by DRM, then there's no technical limitation on copying or redistributing the file, but according to your license agreement you're not permitted to do so.
In practice, no one is probably going to come after you for copying your music files or ebooks across your devices or sharing it with friends, but you don't own the file. Try mass distributing it or reselling it long enough and you'll attract someone's attention.
If the files are not protected by DRM, then there's no technical limitation on copying or redistributing the file, but according to your license agreement you're not permitted to do so.
In practice, no one is probably going to come after you for copying your music files or ebooks across your devices or sharing it with friends, but you don't own the file. Try mass distributing it or reselling it long enough and you'll attract someone's attention.