An excellent takedown by Steve Sailer.
In particular, I am annoyed by this statement of Guinier's:
When a city replaces a bad test, as New Haven wanted to do, the employees who did well on it do not lose their right to compete for promotions
No, they did not lose their right to compete, but they lost their right to a promotion that they had earned. Also, if you can only compete as long as the deck is stacked toward a certain income, then you do in some sense lose your right to compete, as you lose whether you pass or fail.
That is all.