Here's why:
* Tim Burton has worked with various studios throughout his career: While he has a long-standing relationship with Disney, he's also made films with Warner Bros. (Batman, Beetlejuice), Paramount Pictures (Edward Scissorhands), and others.
* Production companies often retain rights: When a film is made, the production company typically retains certain rights, such as distribution and merchandising. Even if a director is heavily involved in a film, they may not hold all the rights.
* Individual film rights are complex: The specific rights owned for each film vary. Disney might own some rights to certain Burton films (like "Alice in Wonderland") while other companies hold rights to different aspects of those same films.
Therefore, it's inaccurate to say that Disney owns all the rights to Tim Burton's movies. You can see this by the fact that his films are distributed by different studios, and some of his movies are available on streaming services other than Disney+.