For what it is worth
stallzerI used the program I have that removes
Canada Post cancellations...BUT, I could not remove it, NOW, if (I hope I am wrong) the stamps were reattached after the fact, the guy aligned the cancellation perfectly, but had to use ink that is NOT
Canada Post standard.
Here is your stamp digitally changed....Notice the double line between the arrows...This is the effect you get with a non
Canada Post cancel (i.e. - a pen of some sort).

Here is a TRUE
Canada Post cancellation also changed digitally...See the difference.

Here is a ball point pen circle I drew...See the similarity...???

I am NO expert, just a thought.