There's really not enough information in the article for me to form an opinion about this incident. The law is probably on the nursing mother's side.
HOWEVER, while I think that most nursing mothers probably nurse as discreetly as possible in public (and I'm not talking about hiding under a blanket), not all of them do. My SIL had a baby around the same time that we adopted our son who was a toddler at the time. She joined a breastfeeding support group. One day, when she and I were at the mall with the kids, we met one of the leaders from her group at the mall. SIL had apparently told the group that she was the first in her family to breastfeed. As soon as she introduced me as her SIL (who obviously had an older baby than SIL's), this lady gave me the what-for about not caring about my child's health because I didn't breast-feed him. (She did not know at that time that he was adopted, and not a baby at the time of adoption... but really, did she need to know?)
While we were together, she and SIL needed to feed their babies. This woman made the biggest production of it that I've ever seen -- and exposed herself a lot (much more than necessary, and much more than I've ever seen anyone else do.) She was a self-described "breastfeeding activist" and was basically DARING anybody to comment negatively about what she was doing.
So while I think that *most* women just want to give their children nutrition in the best way they can. There are some who are over-the-top ridiculous about it... and this article makes me wonder if she was one of those.