That doesn't look good on your CV if you were CEO when this plan was put in action
That could be why he quit now... protect his golden parachute, claim he took responsibility and did the right thing even though he claims he knew nothing about it. Other companies will look at him and say: "Oh, a CEO with ethics, grab him.". <For some value of ethics as defined by corporations>
The question that will never be asked is: "Why didn't he know? He was in charge."