Correct Roger
At one time D may of been thinking about putting them into the game - and in the Players Manual for the longest time Undead Captains were mentioned (the pages being drawn up before completion of the game - they were possibly removed before beta release) which over the past few years has created some confustion (and a few threads like this one looking for them), but they never did make their way onto open, several hard attempts have been made by players using different methods to locate them have discovered none, and possibly one day - D may put some in (along with skelley flagships besides the undead French and Spanish)