They stopped using the Fleming novels as source material long ago.
You Only Live Twice merely used the Japanese setting. On Her Majesty's Secret Service was fairly faithful to the book, but Diamonds Are Forever again merely used the Vegas setting.
The Spy Who Loved Me ditched the novel, only using the title. And that was 46 years ago.
Since then the films merely took the titles and an occasional random idea. For Your Eyes Only (film) and License to Kill (film) both borrowed from Live and Let Die (novel).
Indeed, Fleming didn’t want the source material of Spy Who Loved Me made into a movie (other than the title).