In "A Moveable Feast" Hemingway describes Scott Fitzgerald with the quote?

No one can ever be certain what Hemingway really meant by a lot of his phrases. However, this appears to be his view that at first Fitzgerald was an extremely talented writer, who wrote very well naturally (as the erfly flies naturally and gracefully). However, as he grew older, his natural writing was changed for the worse, without his realizing it. This may be, in Hemingway's eyes, due to the influence of Fitzgerald's wife (who Hemingway disliked), or the need for Fitzgerald to supplement his income by writing short stories for magazines that, as Fitzgerald admitted, were altered from his initial writing to make them saleable (the brushing and marring of the erfly wings). As time went on, Hemingway believed that Fitzgerald lost the ability to write naturally, and could only work at writing, producing mediocre material. Hemingway was an admirer of Fitzgerald in his early years, and always felt that after writing The Great Gatsby, Fitzgerald was capable of writing better novels, but that was not to be.