That's not what that article says, if I'm understanding correctly: "PPUs all have the same value associated with them and, during a tender offer, investors purchase PPUs directly from employees. OpenAI makes offers and values their PPUs based on the most recent price investors have paid to purchase employee PPUs."
Doesn't it end up being a "no disparagement until the company goes public" clause, then? Once you sell the stock, are they going to come after you for the proceeds if you say something mean 20 years later?