Well, and we also need to factor in age. Millennials are, as defined in the article, 18-37. At what point would you expect substantial savings? Anyone going to college likely isn't even going to start saving much until they're 24-25....and if they go to grad school, later than that. Then factor in the cost of college (tuition as an in-state student at Iowa my first semester was just over $1,000, now it's probably 10-12x that). There's a cost of getting started in life, as well.
Assuming a roughly equal distribution from 18-37, I'd actually expect that a solid 35-50% likely won't have much savings simply due to their age and position in life. Add on top the stupidity of youth and the numbers in the story aren't really surprising at all. Probably could have written the same story for Gen Xers as well 20 years ago. I'm on track for a good retirement (maybe even early if things break right) and we didn't have much until I was hitting my mid-30s due to grad school, a career change and kids. Good basic habits, though, put us in a good position for the point where promotions and new opportunities mean significantly more income.
That's how life works for a lot of people. Maybe the Millennials will prove to be fiscal morons, but right now I think there's a lot of generational piling on. Let's give them a chance. At some point, they will rule the world.