Thank you for your question, Mr. Barsalou‑Duval.
First, I want to make clear that there wasn't any confusion.
Before the flight, we spoke with Transport Canada and we asked the FAA to reroute the flight to keep it out of Canada's airspace. That's when the FAA controller indicated that they were aware of the NOTAM and that the aircraft was authorized to enter Canadian airspace because it was a humanitarian flight.
According to the procedures in place at that time for air traffic controllers—procedures supported and even mandated by the ICAO—we had to give the aircraft clearance because it had declared itself a humanitarian flight. The same rules would apply to a search and rescue or medevac flight. Those were the procedures in place at the time. The controller on duty followed those procedures and allowed the aircraft to enter Canadian airspace, in coordination with the FAA controller.