This is going way too far. If they really were concerned with the batteries being in good health then they might as well ban all cell phones too because the Note 7 is more dangerous than any laptop made in the last decade. It's not even safety at this point, it's paranoia from people who have no idea how the world works. If I'm in a plane for 10+ hours, I better have something to do in the meantime. Well, whatever. Let's hope that this ban doesn't apply to flights within Canada, or else I'll be really pissed.
US Homeland security has no jurisdiction over flights within other countries so I think you're safe.