Lets talk bookish: What is the meaning of diverse books?

For obvious reasons, discussion of diverse literature is something dear to my heart. Diverse equals different, it equals something that doesn't follow the norm. What is the norm? Norm is Western European powers ( England in particular) and USA. Norm is not diverse. 

As an ethnic minority of Eastern European population ( maybe I should say Soviet Union,) stories that are written by authors and people from Eastern Europe are diverse because our experiences and history are different; the way our lives are lived is a lot different than the norm, and that pertains to food as well. 

If an author writes about a Spanish character set in Spain, will that be diverse? My question might be, where will the book be bought and background of an author? If a book is bought in Spain, I don't see it as diverse because it's speaking to people who have similar experiences. Background? What is authors background? If it's a marginalized background like maybe a Roma gypsy or a Jew, I would see the story as diverse because they are bringing a point of view not often explored. 

I also think the term diverse encompasses all those terms and more, and it also will depend on who is in charge and where that book was bought. For example, I cannot imagine that a book by East Asian author will be seen as diverse or marginalized in their country of birth. ( ex. Han Kang, Minae Mizumura, Wang , Eileen Chang, etc.) But if translated and carried over to another continent or country, then the stories will be diverse because they are different than the norm. IBPOC people in America face a different task because in America and  possible ancestral nation they come from they will be seen as marginalized voices.