Because the Blu-ray is a restoration , not a reproduction. For Nausicaa , the Blu-ray removed grain, adjusted colors to Miyazaki's current preference, and re-recorded the score. While beautiful, it is a revisionist document.
and storyboard collections, are also archived, providing insight into Miyazaki’s early creative process. Internet Archive 2. Film History and Rare Media nausicaa of the valley of the wind internet archive
The Internet Archive serves as a comprehensive repository for Nausicaä of the Valley of the Wind Because the Blu-ray is a restoration , not a reproduction