2017’s Exit West by Mohsin Hamid is definitely not speculative fiction. It is general fiction, literary in nature, which uses a trope of speculative fiction as one way to explore the nature of war, love and human migration.
There is always a risk when a general fiction writer “discovers” speculative fiction and tries to write it without having read within the genre. The story often contains hackneyed, tired-out elements which the writer trumpets as new and amazing. Hamid dodges this risk completely.