My view of that is you tell people what they "need" to know..not what they asked. Your implying the opposite....
I have no idea what the author of that is implying.
From my persprctive too many people see knowledge as power....to never be offered unless explicitly asked for..and even then..avoided if possible. That is what you tend to get on a company "run" forum. This is a company "hosted" forum, run by its users. I expect we all want to offer as much information as possible....
P.S I have just read a treatise of that book. Its al about seeing communication in terms of saving time and money. So if someone needs to ask a second or third question...that is wasting their and your time..and hence is a waste of money.