Generating new data similar to what’s in a training set set isn’t the only type of AI that exists, you can also optimise a different goal, like board game playing AIs that are vastly better than humans because they aren’t trained on human moves. This is also how ChatGPT is more polite than the data it’s trained on, and there’s no reason to think that given sufficient compute power it couldn’t be more intelligent too, like board game AIs are at the specific task of playing board games.
And just because a topic has been covered by science fiction doesn’t mean it can’t happen, the sci-fi depictions will be unrealistic though because they’re meant to be dramatic rather than realistic