All this book does is say it’s ok to misgender someone if it’s more convenient for their family and partner to do so.
DO NOT say someone is nonbinary then proceed to have the main character call them/refer to them as he/him the rest of the entire book. There supposed to be the love interest and the main character has so little respect for her partner that she just misgenders them the ENTIRE book with no correction at all. This is a very harmful representation of “diversity” as it’s about as diverse as a cis white woman who is power hungry and gets away with murder (which… is basically the plot of this book).