Earlier quoted context omitted.
I don't think the problem people have is "Richard Feynman didn't produce content" It's "the content that people interacted with that they formed an opinion on "Richard Feynman" from was actually editorialized and published by other people" They're not trying to take credit from Feynman, theyre trying to divorce the character of "Feynman" as written by these authors from the real historical person
To the extent that the character of "Feynman" as he appears in books like Surely You're Joking is different from the real historical person, I think the difference is due to Feynman himself--the way he told the stories orally to people like Leighton. I don't think it's due in any significant measure to people like Leighton "editoralizing" when they wrote up the stories for publication. So again, I think "never wrote…
With some more thought, the fact that he wasn't the direct author of any books is interesting but not really that significant to his character, so i can't see much reason to point it out other than to discredit his achievements.
Though if the achievement being discredited is the number of books he's seemingly written then it makes sense to a degree.