You changed your post. You mentioned Levine. I don't know what else you changed. But Levine posted this in his article. I don't know where you're getting the part where he can sell half his shares.
"If Zuckerberg needs to pay taxes, he can sell his new zero-vote shares to raise money without diluting his voting rights. Not too many: He can “immediately sell or transfer up to 20% of the shares of Class C common stock that he receives in the Dividend, representing 10% of his overall economic stake in the Company, for any reason,” but the board “negotiated for and obtained Mr. Zuckerberg’s agreement that 80% of the shares of Class C common stock that he receives in the Dividend be subject to the Stapling Condition,” under which he can’t sell those no-vote shares without also selling some high-vote shares. The basic deal remains intact — he needs to own a meaningful chunk of shares to keep voting control — but there’s a liquidity buffer for taxes."
"If Zuckerberg needs to pay taxes, he can sell his new zero-vote shares to raise money without diluting his voting rights. Not too many: He can “immediately sell or transfer up to 20% of the shares of Class C common stock that he receives in the Dividend, representing 10% of his overall economic stake in the Company, for any reason,” but the board “negotiated for and obtained Mr. Zuckerberg’s agreement that 80% of the shares of Class C common stock that he receives in the Dividend be subject to the Stapling Condition,” under which he can’t sell those no-vote shares without also selling some high-vote shares. The basic deal remains intact — he needs to own a meaningful chunk of shares to keep voting control — but there’s a liquidity buffer for taxes."