Changing the subject, the two meanings given here have nothing to do with nonbinary people:
1. not relating to, composed of, or involving just two things.
"Aristotelian ontology is nonbinary on the second level in that it allows for degrees of being"
2. relating to, using, or denoting a system of numerical notation that does not have 2 as a base.
"the enumeration data is stored in a nonbinary format"