I honestly don’t care if the deleted scenes are canon or not, what bothers is that they constantly change their decision to whether make them canon or not without giving them any serious thought.
I wouldn’t be surprised if Adam said they were canon in order to get more people buying the DVDs, then decided to change his mind because people told him how some of the scenes contradict what happened on the show. However, in my opinion, it doesn’t matter anymore because the show contradict itself and doesn’t make sense anymore with or without the deleted scenes.
In addition, I’ve never heard of a show where deleted scenes AND book tie ins are considered canon (with the exception of tv series continuing in the form of comics like Buffy- which is not the same thing).