I always saw expats as something between immigrants and tourists. They aren’t trying to switch countries and they aren’t just on vacation. There’s plenty of good reasons for this category, like being sent somewhere by your employer. This naturally creates a community of foreigners who aren’t necessarily worried about fitting in as a new citizen or permanent resident would be.
But yeah, this idea that Western countries have expats instead of emigrants is weird.
I think that was the point. To be silly.