Actually both statements are completely accurate. The sludge is probably at least 98% organic in composition and it is certainly very rich in nutrients.
As the article says, it may also contain some things that aren't so good for the soil, but that doesn't make the two statements untrue, just incomplete.
The ideal way to deal with sewage is to return it to the soil. That's the natural way. Only problem with doing so with human waste, as such, is making sure pathogens are killed off. I suspect irradiation would do a darn good job at low cost.
Unfortunately, we have a lot of other stuff mixed in with the human waste due to the way we collect the stuff, so it's probably not that great an idea.
I certainly wouldn’t use it on my garden, I mean many things like lettuce are consumed uncooked and unheated.
Family farms like ours want to be around for generations. "Industrial" farms aren't looking beyond the next financial quarters