The Unitrade is correct. There are a couple of ways to verify this...
1. check other stamps; they are
all untagged.
2. read
Canada Post Details. The July-September 2012 issue included an Erratum (pg 3) that states: "The $2 Queen Elizabeth II engraved pane of eight stamps and souvenir sheet of one stamp do not have tagging."
Obviously this correction was not passed on to the people who maintain the
Canada Post website. (never trust everything on the internet!)
Robin Harris
Editor, Unitrade catalogue