My short answer to this question is, I'm not entirely sure. I think it's too easy to say it is "not genre," but consider the novel Station Eleven (the link will take you to the goodreads page for the book). Station Eleven is definitely science fiction/dystopian fiction. But it was a finalist for the National Book Award and was nominated for the PEN/Faulkner, both very prestigious literary prizes.
Something about that text, much like Interior Chinatown, does something more than the the gimmick of a genre (or in the case of Yu's Chinatown, a structure). That's incredibly difficult to pin down, and, in fact, it would seem that it's often the opinion of others that makes something literary and something not. The awards are, after all, the codification of a set of people who have been deemed experts and knowing it when they see it. Basing a texts quality on whether or not it wins an award is about as useful as deciding it is an important text based on sales. Of course both things happen in the actual world.
However, for our ICRN, I'm asking you to treat Interior Chinatown the way you would treat any text you might encounter in any literature class.That is another way to think about what makes a text "literary": what can the reader do with the text? What ideas/motifs/themes/images can a reader dig in to and make mean something? What work does a reader have to do to be able to understand not just plot but purpose in the text?
WHAT TO POST
Thus, post, in 200 to 300 words, a short close reading of some aspect of Interior Chinatown. I'm not asking for reaction. I'm asking for analysis. Make sure I can tell you read the novel.