That's not how it works, oracles need to mark what they're going to negate. They can't mark something that isn't on the same time space as them. Which is why you get oracles where ever you're ported to.
So oracles in the past can't negate someone in the future.
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Well, technically since Goku alone is trapped in the future, and no one is there in present, then technically he gets Lost in the Dark Corners of Time and dies?
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Touché lol