First, you read wrong. Go and check their website.
Second the adapter for the extender was just released by Orbea. Unlikely anyone has any pics yet but you can email them.
Ok. I read a few pages back here in this tread too. Many people say you cant add the extender and many say you can. So has anyone actually put one on the Orbea? No one has posted a pic and there seems to be a lot of couch mechanics in this thread.