I would agree with this - while Stockdale does say he never used the words stoicism or shared those specific ideas - he was the highest ranking officer and in charge of how the men operated.

In the situation that they were in, if you had someone that was holding up fine and doing what you thought should be done - there is no reason to tell them the stoic terminology for what they are doing.

If you are trying to share knowledge and best practices throughout the camp, you don't need to explain how the ideas came from someone dead for thousands of years.

But saying that Stockdale is turning in his grave because we associated him with Epictetus I think is actually the opposite of what is true.