Not requesting a particular asset over the network is probably not circumvention or exceeding authorized access. Accessing the APIs to retrieve content through an entirely alternate program, unfortunately, has been deemed circumvention and the site would have a case against anyone who tried it. Not that the court of public opinion would come down on their side, but the law certainly would.
I think in a world where using curl can get you charged and convicted, adblockers certainly stray dangerously close to exceeding authorized access under the CFAA. I don't think this is right, but I do think it's the reality we currently live in.