One thing which hit me when reading it, was the cache of email addresses, all to receive this 'Canadian Eyes Only' and 'Secret'.
For anyone, it creates a chain of people who are ... required? Important enough? Need to know? Said info...
There's like a few security implications here, such as, whom to apply pressure to. Some GoC department employees, on even LinkedIn for example, are restricted from indicating who precisely they work for.
For this very reason.
Even non-compliance-with-pressure tactics are a concern, for it helps to know whom precisely to attempt hacks against.
Some might say "Meh, they probably already know this and that", but things like this are precisely how they already know this and that.
That said, it's rather mis-characterized by Rebel News, I was only able to read the title of the Globe and Mail piece, but it seemed like a more accurate representation of the source document.