From what I understand from the experts in this forum and from the IRCC is that study permit approval and passport visa stamping are two different things. While study permit approval is purely internal and it is a permit given for you study in Canada for the duration of the course, the visa in the passport stamped is not part of the study permit. As you might be aware, the study permit will only be given to you by the BORDER OFFICERS in Canada, when you land at the airport. In principle, they will decide whether or not you should enter Canada. I read somewhere in this forum that someone deferred their program but the study permit was approved already. In this case, IRCC replied in a webform saying that the student can travel with the visa with the passport, but they should show their new or LOA deferred for that session to the border officers. When the border officer get to see this new LOA, the study permit will be issued for the new LOA or for the deferred program. So, we are only send the passport to get the VISA to travel to Canada, and the purpose of the travel will be only dealt at the airport. I hope you guys make a difference out of it. The study permit is not VISA, but you need a VISA to get you to travel to Canada.