The congé parental is paid, but so little that few people can afford to take it (I can't...).
I've been told it's been increased, but have no details. Maybe the better educated take congé parentaux because they are often also better-off?
The article focuses on how some people (the ones we notice because they shock us?) bring up their children in France. I, too, am always stunned when the neighbour tells his 5-yr-old son he's going to shut him in the cellar and make him chop wood for hours as punishment for having committed some minor misdemeanour, or says (yesterday's classic), "if you fall off your bike and open that graze on your arm, I'll cut your arm off" .
However, I don't think it does make his son better behaved. Just a bit confused, since no matter how badly he behaves he has not yet had to chop wood in the dark with the spiders for company, and his arms are both still there.
IME as a teacher, the very upper echelons of French society bring up polite kids who chorus "bonjour" and trot off to violin lesons in pinafores and pigtails; the vast majority don't. There are all sorts of children in France, as there are everywhere, and many are badly behaved at school or elsewhere as a result of their strict upbringing, which they rebel against as soon as their parents' backs are turned.
I know many loving, Earth Mother types in France. Then again, I live in a world very unlike the 6ème arrondissement...