Nope. It means that, should you ever be able to log in to HBO GO on your PS4 with your Comcast account, Comcast won't be able to do much to degrade the stream.

Nope. It means that, should you ever be able to log in to HBO GO on your PS4 with your Comcast account, Comcast won't be able to do much to degrade the stream. The authentication of pay services is outside the purvue of Net Neutrality.