As I read it, 517.32 gives a list of things that are required to be on the LS branch. So the question is, how do you know that the automatic door operators are there for convenience only? Some person, likely an architect, will have created a "Life Safety Plan" that includes paths of egress. The fact that a particular door has an automatic operator does not mean that that door is included in a designated path of egress. Nor does it mean that the automatic operation is a key feature for which the Life Safety Plan is taking credit. Please note also that the presence of panic hardware is not enough of a clue. The fact that a person could easily open the door by pushing the bar does not tell you whether the Life Safety Plan requires the door operator to be available for use.
So the answer lies in another question, a simple question of fact. Is that door's automatic operation a required feature, or a convenience feature? If indeed, as you suggest, it is not a safety feature, then it need not, indeed should not, be powered by the LS branch.
Welcome to the forum. Sorry my response cannot provide a final resolution for you.