Your link has a definition of Net Neutrality in the first paragraph. If you recall, one of the big points that groups like Comcast kept trying to make was that

Your link has a definition of Net Neutrality in the first paragraph. If you recall, one of the big points that groups like Comcast kept trying to make was that they weren’t just a dumb pipe for the internet, and instead had enough value-add for consumers that people would choose them over a competitor with the same internet service. And NN would prevent them from offering these competitive services.