I'm aware of the origins and being a student of Japanese, I can say you are not wrong, but also not completely right. Hentai means pervert, but is also directly a term used to describe a particular kind of art (porn). You can say that Hentai is 'derived from the Japanese word for pervert' in the same way that seme, uke, and yaoi are all derived from Japanese words (seme=to give, ect). Also, Anime is short for Animation, but is usually associated with Japanese cartoons erroniously. Its the words new connotation as opposed to its denotation.
So as I said. You aren't wrong, but you're also not right.
I'm aware of the origins and being a student of Japanese, I can say you are not wrong, but also not
