Extropian only in the sense that it would give you a greater control over your body, letting you change something that couldn't be changed before. As Dr. Lawrence Bloch said in the article, "We're engineering part of the human body to do something a lot better that it was originally meant to do." - that's part of what transhumanism would like to be able to do (and ergo an extropian goal as well, given their market-orientated approach)