It's in the definition section, and usually you phrase a definition in the singular. I think that's the answer to your question. You'll see that in the original bill: “committee” is singular, “competent minister” is singular, and so on. So I think that's the answer to your question.
You make a good point. Why is it not “civil society organizations”? Well, certainly in the product, in the demonstration to Parliament, she can't simply say, “Well, I consulted with a civil society organization.”