No, it isn't. A student of mine (Tom Levak) coined the term for what I do back in a magazine article roughly 1977. I then wrote a book using that term (American Freestyle Karate: A Guide To Sparring Unique Publications) in 1979. It was published in 1980 and is still in print. Although it is the formal name for what I teach others have used it more as a generic term for American Karate. There is a group in Southeast USA that is AFK as well. The Wisconsin group might be using the book as a guide or might not. I don't know. Yours, Dan Anderson