Sick-os. With a capital S.
There's only so little a chance this could be exaggerated. I mean, 400+ children? A lot of them half-siblings? Sheesh... And of course, there's the "Saint" supporting their opinions. A classic mythical community too, the way they're "cultivating" their children to continue their way of living.
Though the article doesn't say, it was probably a very closed and autonomous community. I doubt the children have been let on the Internet or were allowed to view more than 3 channels on TV...
I regret how this might affect how people look at "honest" communities like the Amish. Although I have to say, I have my doubts still about whether anyone should live in such a sheltered environment during childhood. (Note that I'm not condemning, I can only express my opinion as an unknowing outsider.)