Robbie, just as a hint for the future. Crab has a huge knowledge, but also is a bit old and hard headed by now. Use the old geezers knowledge, but don't argue. Think a bit in terms of a retirement home where you try to get information from your great grandfather, where he hid all the money and jewellery.
If he does not agree with you, he will argue until the cows come home. Therefore, let it go.
Never forget, he was formed by the British military and therefore a flying god (now retired).
AFAIK, there is now no national aviation authority anymore that uses the term SWP at all. From a "do not confuse" point of view, it is better, just to let it die. End of story.
Regarding the Canadians, it's either a dig towards the US or they wanted to make a point for pilots coming from the US to fly there. Makes sense, if you have some godlike pilots from the US who argue until the cows come home (Actually, you find them in every country). Make a point in the regs and you save a lot of Canadian FI's nerves.