"A huge comeback" is a big overstatement. Overall, it's still a burnt-out husk of its former glory. But it is true that the city proper has developed something which it lacked circa 2000, which is non-auto jobs (Quicken Loans + some other tech startups), a downtown art scene, young people, music, some hip food, and so on. In other words, it's germinated the embers of a much smaller, bougier, more livable town than existed at any time since the mid-late 80s.
For reference, the Detroit was the 5th largest (some sources say 4th largest) city in the US at its peak in the 1950s, similar in size to LA. It's now 27th, with about a third of its peak population.
