It’s a waste of time. It’s like a welding certificate for someone going for a mechanical engineering degree, or a First Responder license for a prospective MD. It may show enthusiasm, but is not a meaningful preparation.
Yes, there is a way to get around this. You just have to convince a university to stake its reputation on the idea that a high school kid can compete at their school with top undergraduate degree holders. And that is very, very hard. Off the top of my head, I know of only one person in recent decades who pulled that off.
As others have repeatedly noted, you learn a LOT in undergrad, but I feel it needs to be emphasized that even if you DID somehow learn all that on your own, you would still need to demonstrate that knowledge so thoroughly that they would risk their individual and collective reputations on you. And you would need to do so in the face of the understanding that for every person who CAN make that jump, there are thousands who believe it, but are wrong. And that means demonstrating it in a public, verifiable, impressive way. Publications, patents, etc. 12 languages and finding AP CS easy are not nearly enough.