Racial metaphor at the heart of the novel

Read this article https://electricliterature.com/kazuo-ishiguros-never-let-me-go-is-a-masterpiece-of-racial-metaphor/ Once you've read it, look at the literary theories section of the PDF Which of the literary theories (1-3 of them) connects with the article's main argument about the racial metaphor at the heart of the novel and how? Here is an additional link to the book talked about in the article: https://www.swgs.wilts.sch.uk/wp-content/uploads/2021/05/Never-Let-Me-Go-by-Kazuo-Ishiguro.pdf