From the May 11 article:
The conversation that night in January, Mr. Comey now believes, was a harbinger of his downfall this week as head of the F.B.I., according to two people who have heard his account of the dinner... Mr. Comey described details of his refusal to pledge his loyalty to Mr. Trump to several people close to him on the condition that they not discuss it publicly while he was F.B.I. director. But now that Mr. Comey has been fired, they felt free to discuss it on the condition of anonymity.
No mention of a memo in the article.
https://www.google.com/amp/s/mobile.nytimes.com/2017/05/11/us/politics/trump-comey-firing.amp.html