That's a clearer article than the ones I found, and the parallels to Elon's "factory over a mine" comment stand out.
The Rouge achieved the distinction of automotive "ore to assembly" in 1927
Promising, until
Ford’s obsession with ever-increasing cost reductions through methodical efficiency studies made life difficult for workers. [In 1937] union organizers led by Walter Reuther attempted to distribute union literature at the Rouge, Ford security and a gang of hired thugs beat them severely. It would be known as the Battle of the Overpass and became a pivotal event for the United Auto Workers and other unions.
I wonder if that's what Elon was referring to as the reason for failure?
Also interesting:
[By the 1960s] there was a growing awareness of the environment... government and manufacturers alike became aware that black smoke had other implications [besides full employment]. ... More manufacturing facilities located within a community, accumulatively adding to emissions, meant more stringent controls. This, in part, led to closure of some older facilities.
GF's focus on renewables should help here. No smoke stacks seen by drone!
Something caused the decline, a move away from "ore to assembly", and the rise of distributed manufacture.
What differs this time? No thugs, no pollution. Same idea, different implementation?