Terrible article and headline. He doesn't actually say why it makes him depressed. Just says it's a dark hole. Which makes sense if you're a world famous successful person with hundreds of millions of dollars - the internet sort of sucks compared to millions of fans lavishing praise upon you while you sip martinis on your yacht.
He touches on one small part - AI generators making "Tim Burton" style transformations of people/characters/whatever, and feeling down about that. He doesn't really say why. I assume because he feels less special that his trademark style can be generated by computers instantly?
Not trying to be a dick here though maybe I am. He's allowed to feel sad. The AI thing from his perspective makes sense. I'm just annoyed that the BBC thought this was worth an article. This is, at best, a tweet that I don't really have any empathy for.