Perhaps in a sense any format that isn't a markup is a markdown. So John Gruber partly created a language which grew into a family of languages and partly coine

Perhaps in a sense any format that isn't a markup is a markdown. So John Gruber partly created a language which grew into a family of languages and partly coined a phrase. I also found it confusing, just trying to see why they would internally say markdown and it would make it out to a post.