Churchill only used "artist - invalid - sybarite" twice, and very early on. Evidently it didn't "stick" as well as others he repeated decades apart. If it had, he might have applied it to Morocco or the South of France, where he was all three of those things from time to time. He found both to be perfect for convalescing, painting, or enjoying the luxuries of life. (Of course, he knew where to stay!)
"Don't worry about attacks on Churchill. He is alive and kicking and haunts the British imagination like no other. He will always be caricatured, as he was in his lifetime. But freedom of speech and expression was one of the things he fought for, and in his time he gave as good as he got. The more provocative comments about him are a backhanded tribute, as they work on the assumption that most people admire him." —Paul Addison
The reader now has the context, and may decide whether Churchill's remark was an expression of imperialist racism, or the fashionable Darwin-Reade philosophy prevalent at that time. In the words of Mark Twain and several showmen before him: "You pays your money and you takes your choice."