Nonbinary is not a gender identity.

Nonbinary is lots of diverse gender identities.

There you go. If you want to accuse me of erasing "the one nonbinary gender", you can just link this post. You can accuse me of erasing "Nonbinary: the gender", as long as you don't believe in "Nonbinary: the genders".

If someone told you that I'm guilty of nonbinary erasure because of the views in this post, that person is an enbyphobe who doesn't think there is more than one nonbinary gender.