But they're not actually in Detroit. It's like how anyone from the general area of southeast Michigan says they're from Detroit.

The real point of TFA, though, is that GM employs the least unionized labor of the Detroit three, which really should have been the headline.

I imagine they used "Detroit" for the same reason metro dwellers claim Detroit. It avoids digressions explaining where places like Auburn Hills or Royal Oak actually are when it's not pertinent to the point. Its short-hand, even if lazy

That’s different. That’s because people don’t know the local cities of the area. I’m sure many people also say South Michigan or if not for Michigan that is done in other states. Either saying the local big city or geographic area location in state.

Vs talking about stuff like Ford not being Detroit because it’s merely close as hell to Detroit and essentially considered Detroit when talking about Detroit as a car industry hub.