Yeah that narrator is real a duality douchebag more concerned with his politics than with Detroit. Not sure where he got the idea that Detroit was ever an "Exemplary City". Must be referencing the 60's or 50's which would be before the narrator was born.
Couldn't actually finish watching the vid, tried, got most of the way through.
Detroit has had beautiful ruins since the late 70's. This is not a new situation. Spending time there in the 80's is how I became fascinated with exploring urban decay. There used to be a bus tour of the ruins. For now
enjoy these photos.
As for jobs & whatnot, yes it is "cutting edge". Detroit was the first post-industrial city in North America. That happened some time ago, not this past decade. These days even Gary, Indiana has lost it's manufacturing odor, which was extreme at one time.