He repeated the story on multiple occasions, mostly in promotional interviews for his 2004 «Boiling Point» book, such as the following example (bold emphasis mine): (gelbspanfiles.com)
The Australian director Gillian Armstrong gave that movie a decidedly feminist bent, even though she shied away from the f - word in promotional interviews. (theatlantic.com)
Other extras: promotional interviews from 1960, a documentary about the blacklisted Hollywood 10 (one of them, Dalton Trumbo, wrote the screenplay), production stills and drawings by director Stanley Kubrick. (sfgate.com)