I think you meant prove the causation. I can prove they're correlated: they both happened! You're right that it's always good to be skeptical about extreme cla

I think you meant prove the causation. I can prove they're correlated: they both happened! You're right that it's always good to be skeptical about extreme claims, but I think in this case it's pretty reasonable to assume that AAPL stock jumping when a famous investor announces "I bought a billion dollars of this stock and it's still undervalued" isn't a coincidence.