You are flipping definitions here. Originally you said by a descriptive definition it’s sarcasm when you do not mean it (which aligns with the dictionary definition by the way, so I’m still confused why you made that point at all). He says he doesn’t mean it, in his speech, verbatim. Your or my interpretation of his other actions and politics doesn’t matter to the question of whether he is being sarcastic. I’m done with this conversation now, good bye.