Why is it sad? Because you cited a source which quoted Trevor Potter exactly as an appeal to authority fallacy error. Then you write that you understand what the appeal to authority fallacy is but can’t even recognize that what you did was exactly that. Here, read this, Appeal to AuthorityWhy is it sad that I do understand how to properly apply logical fallacies? That makes no sense at all. But then . . .
So, yes it is certain that you made the appeal to authority fallacy, and that you either don’t really understand the error when you claim you do or are so lacking in comprehension to recognize it, and that you can’t make sense of plain words. It is also certainly sad, quite sad. Not that you understand logical fallacies but because you have demonstrated that you actually don’t but claim you do. But then...