This is a very biased introduction into intelligence research. Part "Iq tests today" creates whole narrative based on "some researchers says..." who is interest

This is a very biased introduction into intelligence research. Part "Iq tests today" creates whole narrative based on "some researchers says..." who is interested in what some researchers say? We want consensus view not some researchers opinion. For good introduction into Iq I recommend first chapter of book The Cambridge Handbook of Intelligence and Cognitive Neuroscience