Er... I think he was being sarcastic. Heavily critical of Mamdani throughout the segment that follows that comment, but ultimately coming down on the approach of (paraphrasing) "Well, as activists it's your job to steer the politicians in the right direction and hold their feet to the fire when they fail", which seemed to let Mamdani off the hook. Might need to watch it again, though it's hard to stomach watching him simp for zionists like that...