The statement is directly corroborated by two separate news outlets, Cointelegraph and Cryptorank.io (Sources 2, 3, and 6), which reported that Polymarket showed a 75-76% probability for Ethereum hitting an all-time high by August 31. While a direct link to the specific market from that time is not available in the evidence, the multiple credible, secondary sources provide strong support for the statement's accuracy.