Oddly enough, he's right. I don't think most Republicans want a trifecta led by a Bush era neo con Republican
This is correct. If Haley represented such an important political tendency within the Republican Party, she would be more than a footnote to Trump's overwhelming victory in the primaries.
The reality is that the type of person who supported Haley, but who will not support Trump, makes up what is now a minor faction within the Democratic coalition. They might think of themselves as the Republican Party in exile, and they probably dream of re-taking the party someday, but at this point they're more Juan Guaidó than Charles de Gaulle.