Well, I'm afraid you are quite wrong.
Identity is an entirely different thing, Here's an example:
Polyamorous: Identity.
Non-Binary: Just gender.
You see what I mean? It does not relate to sexuality, romantic orientation, ace-spec identity, aro-spec identity, tertiary identity, gender, xenogender, or any other existing categories.
You can learn more about it here: https://lgbta.wikia.org/wiki/Category:Identity