The author is drawing the wrong the conclusion-knowledge relationships can be asymmetric.
The forward relationship of a fact (What is Tom Cruise’s favorite color? Green) may be worth knowing, but the reverse relationship (Who’s favorite color is green? A billion people, including Tom Cruise) may not be worth knowing.
The forward relationship of a fact (What is Tom Cruise’s favorite color? Green) may be worth knowing, but the reverse relationship (Who’s favorite color is green? A billion people, including Tom Cruise) may not be worth knowing.