Sure you can say the Oracle could qualify as a HS, though it’s gonna be more of a problem of who since the Oracle wasn’t just one person. Though the one we know and probably greatest one is Pythia so that’s fine. Would she be a Divine Spirit? Doubtful, as well there not a God. One thing to point out but divination isn’t actually that rare so really you have many who can qualify even in Greek myth, top of it would be Apollo himself, God of Prophecy and is the reason the Oracles of Delphi could see the future thanks to him possessing them. But just because he would be the most obvious doesn’t mean it is him though, they can pull a Caenis case in this. So who knows on that front