duperemove not universally available.
The article should note that duperemove isn't available for all platforms all the time. If this means it is appropriate to 'revert' to bedup, noting so (this wiki article being the 'expert') would be useful.
Also, it would be worth mentioning that Ubuntu has a ppa for it / duperemove does not come with btrfs-tools (else one keeps hunting for what one doesn't have, and the new user will be baffled.)
Per http://askubuntu.com/questions/631917/how-can-i-deduplicate-my-data-with-btrfs it would be useful to note that https://launchpad.net/~lordgaav/+archive/ubuntu/duperemove exists, albeit only for trusty (14.04) or later.