First, the JFK FSC admitted his remarks. Second, this guy isn't an employee. He's elected by the shareholders as an outside. Directors aren't typically fired without a shareholder vote. In the case of P&G, he resigned.
Maybe Arpey has already asked for his resignation, and he hasn't acted on it? Or maybe they feel there's not enough of a basis to do so yet.
Nothing has been proven other than records showing a phone call took place between the two. Unless they were also wiretapping him, the circumstantial evidence may or may not be enough to convict, especially since he didn't personally profit from the action.