"And even Bartick notes that it’s impossible to know for sure if breast-feeding itself causes less disease or if women who breast-feed simply have healthier habits." See, that's the real problem here. Correlation doesn't equal causation. Women who breastfeed are often better educated and healthier to begin with. It's nice that they got an expert in causality, but his no doubt more extensive remarks are so boiled down in this piece as to be useless, and I can't access the original text, so I'm dubious that there is a real causative factor here.
IMO, breastfeeding is a choice women should be able to make if we want to and receive societal support. I wish that the rhetoric defending our rights to receive support didn't need to be couched so much in the purported health benefits of breastfeeding. Even if breastfeeding has no or minimal health benefits, it should still be a mother's choice how to feed her baby and mothers should still be able to access lactation assistance, get time off from work to pump, etc.