Nikki Haley did not win the 2024 Republican Party presidential nomination. She suspended her campaign on March 6, 2024, after heavy Super Tuesday losses, leaving Donald Trump as the last major Republican candidate for the nomination.(aljazeera.com)

The GOP primary results show that although Haley won the District of Columbia and Vermont Republican primaries, Trump dominated the rest of the contests and secured the delegate majority.(en.wikipedia.org) Trump became the presumptive Republican nominee on March 12, 2024, when his delegate count passed the required threshold.(en.wikipedia.org)

Because the prediction was that Haley would win the Republican nomination—defeating Trump, DeSantis, and others—and the nomination instead went to Trump, the prediction is wrong.