The most relevant and authoritative evidence comes from a reputable financial news report citing Bank of America Global Research, which explicitly states that the yen–TOPIX correlation has turned positive for the first time since 2005. This aligns with the claim and is supported by another market commentary source noting historic significance of the shift. While other sources provide background on Japanese markets, they do not directly address or contradict the claim. The primary supporting source is both credible and specific, indicating robust evidence. There are no significant contradictions in the evidence, and multiple independent mentions of this correlation flip reinforce its plausibility. The only limitations are that some supporting content comes from social media posts with lower authority, but these act as secondary confirmation rather than primary proof. Given the specificity of the Bank of America citation and absence of counter-evidence, the statement is highly likely to be true.