too long to throw in the towel and support Trump, it's impractical to expect any state to reprint ballots, which are different for each County, due to the down-ballot contests.  I don't see where Trump gained much from his endorsement because of this delay.  

Are you referring to this RFK Jr:  
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https://www.nytimes.com/2024/08/28/us/politics/rfk-trump-criticisms.html
‘A Terrible President’: 12 Times Robert F. Kennedy Jr. Criticized Trump.
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"Mr. Kennedy had spent the better part of a decade lobbing attacks at Mr. Trump, portraying him as a buffoonish, anti-democratic bully who led a feckless administration. “In many ways, he’s discredited the American experiment with self-governance,” Mr. Kennedy said of Mr. Trump in early 2020.
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July 2, 2024 “Donald Trump was a terrible president”
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June 19, 2024 “Absurd and terrifying” Mr. Kennedy said on social media that Mr. Trump had an “imperial plan” for American foreign policy. “It is not an ‘America First’ strategy, nor will it make America great,” Mr. Kennedy wrote
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June 13, 2024 “He spent more money than all presidents” “President Trump ran up $8 trillion — more money than every president in United States history from George Washington to George Bush,”
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June 11, 2024 “A weakness for swamp creatures” During his campaign, Mr. Kennedy repeatedly suggested that Mr. Trump presided over a corrupt administration. “Despite rhetoric to the contrary, President Trump has a weakness for swamp creatures, especially corporate monopolies, their lobbyists, and their money,”
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May 24, 2024 “He didn’t stand up for the Constitution”
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April 27, 2024 “A barely coherent barrage of wild and inaccurate claims” “When frightened men take to social media they risk descending into vitriol, which makes them sound unhinged,” Mr. Kennedy wrote on social media. “President Trump’s rant against me is a barely coherent barrage of wild and inaccurate claims.”
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April 1, 2024 “Appalling” Appearing on CNN, Mr. Kennedy said Mr. Trump’s efforts to reverse the outcome of the 2020 election were “appalling.”
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Jan. 14, 2020 “He’s a bully” Early in the 2020 election cycle, Mr. Kennedy told Yahoo Finance that Mr. Trump had “discredited” American democracy, calling him a “bully.”
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May 17, 2018 “Buffoonery at a high level”  “If you live in China today, and you’re looking at what’s happening in the United States, why would you ever say, we want to switch our system for that system, which can produce that kind of buffoonery at a high level?” Mr. Kennedy asked. Mr. Kennedy said Mr. Trump was “purposefully and systematically” supporting “tyrannical” governance by other world leaders. “He is also encouraging it by the example of what a disaster democracy’s become,” Mr. Kennedy added.
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Aug. 15, 2017 “I don’t like President Trump’s environmental policies” “I would say that President Trump’s administration is essentially destroying 30 years of my work on environmental issues,  
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Aug. 5, 2016 “It’s scary” Mr. Kennedy used those two words to describe Mr. Trump’s political rise, three months before Mr. Trump beat Hillary Clinton in the 2016 election. In an interview with Larry King, Mr. Kennedy said that he was squarely behind Mrs. Clinton and that Mr. Trump was tapping into an “atavistic urge for a leader who is kind of a man on horseback who’s decisive, who’s violent.” He added: “It’s scary.”
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March 15, 2005 “We need some positive role models” In an interview with The Boston Globe, Mr. Kennedy cast Mr. Trump’s flashy life as a poor example for Americans to follow.
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MAGAs might find some consolation that RFK Jr. didn't refer to Trump as "America's Hitler." That was Shady Vance.