I mean, he's walking through his very solid reasoning for why the headline fails the sniff test, despite being a factoid that is frequently repeated through many channels by many people.

People talk all the time about how we need to strengthen critical thinking skills in the general public. Outside of formal training, this is what that looks like: a culture of publicly explaining the thought process that leads you to question something that many others have accepted without question. The knee jerk reaction of criticizing such statements as rude or overly negative is a big part of why these skills have such a hard time spreading, since people who have the skills feel it's not socially acceptable to share their conclusions.