Hey there - asking this from a place of genuine ignorance and desire to understand more - what exactly does "nonbinary man" mean to you? My understanding of nonbinary gender identities would see this as essentially a contradiction, since I would say that being nonbinary, by definition, means that someone doesn't identify as a man or a woman.
Feel free to not answer if you don't feel like diving into a whole discussion about your own identity; I'd totally get it. Just a cis gay dude trying to understand a bit more.