Where does this guy get the idea that there are only a few grams of useful material on a given astroid? Check the potential targets section of the Wikipedia art

Where does this guy get the idea that there are only a few grams of useful material on a given astroid? Check the potential targets section of the Wikipedia article, there are many astroids with hundreds of billions of dollars of value. https://en.wikipedia.org/wiki/Asteroid_mining https://en.wikipedia.org/wiki/Asteroid_mining