Nope, you are the one who has mistaken. Trump endorsed McCarthy for Speaker after the GOP won the house last November, and has been quite public about it since launching another Presidential bid. Here are some articles from DECEMBER 2022, which confirm that fact:
https://www.mercurynews.com/2022/11/14/trump-works-to-defend-mccarthy-as-he-eyes-24-bid/
https://freerepublic.com/focus/f-news/4117179/posts
Then please explain to me how an obscure “endorsement” back in mid December of last year “swayed a handful of Rep votes” AFTER the first couple of voting rounds on Tuesday.
Either way you rational makes no sense aside from being inaccurate.