It's “ghostwritten” by the same measures interviews are. There exist recordings of Feynman telling the stories to Ralph Leighton.

As the video points out, Feynman was telling tall tales to impress a much younger man, Ralph Leighton. Ralph Leighton decided to publish stories that told a specific narrative, that being an asshole was cool, and he omitted more wholesome stories about Feynman being supportive of women.