Dan Rather's side of the story:
CBS appointed a panel led by Republican Dick Thornburgh, former governor of Pennsylvania and United States Attorney General under George H. W. Bush, and Louis Boccardi, retired president and chief executive officer and former executive editor of the Associated Press. Released in January 5, 2005, their report concluded that CBS rushed to make inadequately verified allegations public and it was slow in responding to criticism. The panel, however, was unable to conclude whether the documents were forgeries or not, nor did it conclude that a political agenda at 60 Minutes Wednesday drove either the timing of the airing of the segment or its content. Like the story itself, the report and its conclusions were divisive....
Rather has stood by the story. In a 2007 interview with Larry King, Rather argued that the review panel was “a set-up,” and pointed to the fact that “nobody to this day has proved these documents were fraudulent. . . . The story was true.” The journalist also talked about the story in his 2012 memoir, Rather Outspoken: My Life in the News, and claimed that internal CBS documents that came to light during his lawsuit show how Viacom lobbyist Carol Melton, under pressure from GOP House Majority Whip Roy Blunt, urged Heyward to retract the Bush/TexANG story. In Rather's words, Melton "made it clear that Blunt was speaking for an even more powerful constituency—the White House.” Rather was especially critical of Leslie Moonves, who was then chairman and CEO of CBS, explaining that CBS should not have retracted the story "but that was the way that Blunt and the White House wanted it, and Moonves chose to oblige." His 2012 memoir led a new wave of articles that revisited the 60 Minutes II piece. Most of them, like the extensive Texas Monthly article in 2012, concluded that the story was and remained far more complex than expected.
https://danratherjournalist.org/about-dan/controversies
Note that Rather's "controversies" page shows he has been attacked by conservatives and the GOP since the Nixon administration in 1972. It's also quite candid on the controversies with which he's been involved. I'd be interested in similar personally-hosted pages from other persuasions.
Moreover, the question was "When was the last time that a CEO got canceled" by the right. I think I've demonstrated and documented that that particular practice is in fact very well established.