No, the book finds that IQ correlates more strongly with success in life than socio-economic advantages. For example, white kids raised in poverty and dysfunction still have higher average IQs than black kids born and raised in comfort and stability. Similarly, twin studies discussed in the book show that twins raised apart have IQs more similar to each other than non-related children with which they're raised in the same household. The book is about the primacy of IQ, a largely heritable trait.
OK.
We must have read different editions of the book.
The observations I made about the different interpretation of the facts includes critical comments by the authors, Herrnstein and Murray, commenting on interpretation in conflict with what was painfully explained in the book.
Reader critics who glanced quickly at the book and then just ran with previously prepared conclusions.