What's odd is the article contradicts itself on who exactly was aggressively questioning/profiling him. At one point they are described as "Air Canada officials

What's odd is the article contradicts itself on who exactly was aggressively questioning/profiling him. At one point they are described as "Air Canada officials" and another "by immigration control." And foreign countries do commonly have immigration officials/security services questioning passengers boarding aircraft to their respective countries. For example I've had extra screening by US officials when boarding an aircraft to the US in London (not claiming to the same degree or for the same reason as what occurred in the article).