The article you linked to appears to describe something totally different. It says that if you delete your music from your computer, then re-downloading the music through Apple Music will give you DRMed files. But it also says:

> If you haven’t deleted your own copies of your music, then there’s nothing to worry about. If you download onto other devices from Apple Music, those devices will get the DRM versions, but you’ll still have your DRM-free originals.