I partially agree to that, Pakistan Team is highly unpredictable and can beat any good side or lose from a minnow on a given day. But beating IND or ENG during the Group Stage of this WC would almost be an upset.
They won't be favorites to win any match besides NED and every other team will think that they've got a chance against PCT, but I also wouldn't be surprised or call it a huge upset if they topple one of AUS/NZ and SA on the Indian pitches (again, with the right selection, approach and captaincy). The matches against SL, BAN, AFG can go anywhere but Pakistan will still have a better chance to get some scrappy wins if they manage to turn up with the right mindset and approach.