You want to hazard a guess as to why DeSantis did not just say that he won big because he reduced voter fraud? Could it be because it would tend to lend credence to trump's assertion his election was stolen?
And that is a very strong possibility. DeSantis does not want to lend credibility to Trump, or help him in any way.
DeSantis is bungling this. If he takes on Trump, he's likely going to lose whatever support he would have for a run in 2028. He can't possibly beat Trump in the primary, and he is listening to all the wrong people.