I agree. I didn’t include any flag polls because I never entered the US. They actually give you a slip of paper saying you were rejected admission and you give that to Canadian border control to start processing your visa. That’s my experience from the four times I’ve done it anyway.When you "flag-poll", the United States of America do not actually grant you admission to the USA, they allow you to turn back to Canada. That's my logic behind it I hope it can help you!