People may be used to different technologies. Many of us just google or see the doc on the fly for such trouble shooting or configuring settings.
But these types of skills/knowledge is different from understanding a computer scientist would require. I would be more worried if someone who claims to know networking doesn't know popular protocols or algorithms like for example the sliding window protocol.
The issues you face in designing, understanding and analyzing such algorithms will change you more than understanding where windows stores the setting to configure one of their protocol parameters.
The author seems too optimistic in many occasions. Case in point: "You don’t need Quora, if you can ask detailed questions in G+ and share them with specific Circles, etc." doesn't really resonate with me. Many of these platforms(stackoverflow, metaoptimize, quora) rely on the expertise of strangers.
On a related note, I read somewhere that Godel was the only person Russell believed had read and understood "Principia Mathematica" besides the author themselves.