Everything you find is written afterwards
Search "what moves the Nikkei" and you get two kinds of answer.
One is the broker explainer: eight factors laid out for you — currency, US equities, central banks, earnings, commodities, policy, sentiment, flows. Every one of them is reasonable.
The other is the news: it moved this much today, and here is a reason.
Both are written after the fact. It moved first, and then someone told you why.
That does not make them wrong. It makes them answers to a question in the past tense.