Came here to say this. He started with 0 shares of class A stock, and ends with 0 shares of class A stock.
What he did do is convert $23m worth of class B stock into class A stock, and sell it.
Adding up all the class B stock & options he holds at the end of the transaction (Table II, column 9), he still holds ~50M shares (worth ~$165 a pop as of this writing).