The actual claim being made is difficult to see on account of the way the article is written, starting with a misleading title. As far as I can tell, the claim is that while people think that taking another person's perspective is helpful, they are not generally as good as they think they are in doing so, because they rely too much on their own intuitions and do not ask enough questions of the other party. I have certainly met more than a few people who find it inconceivable that anyone would see things differently than they do, though I doubt that many of them are among the people who think there is much value in trying to see the other side's point of view.