Because he wants Brexit to happen and, like many other Brexit "wing n a prayer" people, it suits his agenda to poo poo any kinda negative info that doesn't match up to his own optimistic agenda without any substance attached to it!!!! Well over two years of watching and listenng to people who want Brexit to happen, a lot has been learned re all the different rhetorical techniques and innuendo employed by the same kinda folk who want to leave the nasty EU, some of them downright stupid (not all of them btw), others programmed by propanganda orchestrators like The Sun, The Daily Mail (now it has changed it's "tune" with a new editor) and many other ones that spoon fed the same EU detractors for the past 30 years!! I live with some older family members who talk this way - "but The Sun said this or The Sun said that"....blah blah blah. Sad but true!!