Why did Alan Parker disown Angel Heart (1987)?

The best theory I could come up with is that it was 'disowned' because of the films disturbing nature and content. Particularly from this scene, as explained by wikipedia:

Angel Heart gained attention and controversy even before its release. Bonet was previously known for her role on the family-oriented sitcom The Cosby Show, and several seconds of her extended, graphic and blood-drenched sex scene with Rourke had to be trimmed in order to secure the film an 'R' rating on initial release, though later an uncut X rated version was released.

This coupled with the rest of the film's dark tone and religious themes might have made it a rough film to talk about in a general show like that, though I won't pretend to know what the show did and did not cover. Unfortunately, this is the best I could dig up.

He did talk about the film in this 35-minute interview from the time for Directors Series. There is also apparently a new interview with him on the 2004 DVD release where he "discusses the original novel from which the film was derived (entitled Fallen Angel). He points out the changes he made, with the author's approval, to the original story. He discusses his love affair with the American south and wonders what all the fuss was about regarding the censorship of the movie's sole sex scene. Toward the end, he seems lost in his own movie and the narrative becomes sparse and obvious. But overall, he does provide great insight into this esoteric movie."