Literally any children cartoon (or any media in that regard), if someone overthinks enough, can be turned into something unintentionally dark. Just search “Game Theory” on Youtube. You will find a channel that has been around for years and are still making videos with millions of views, not to mention branching out to other media, and their career bases solely on dark theories on video games and movies. That doesn’t make any of their theories something more than pure entertainment. Unless the original creators confirm their claims, or intentionally make their work open to interpretation (like Undertale or Five Night at Freddy’s), no one takes their theories as facts. So no, Disney doesn’t confirm anything about Lion King, nor do they make Lion King intentionally vague. This will remain a fan theory and not an “example” of anything.