Pakistani media is free to write and publish whatever they want, they are not free however not to get removed from air the next day by PEMRA, or by concerned individuals representing concerned institutions who express their concerns to the owners of their media houses, hence subsequent self-censorship. Additionally, in some cases, one must also consider the possibility that one gets lost on the way back from work, persuaded to go on a trip to the northern areas, or recuses himself from his life abruptly for a few days, following any particularly egregious act of overzealous investigative journalism or opinionated op-ed. In that, the UN panel has a point.
This of course only applies to a certain number of journalists in Pakistan, most of our commentators do not have the trained journalistic background that requires some relevant educational qualification, ability to investigate and research, to write articles and bylines, contribute to some reputable organisation for a number of years, etc. Social media is changing the game a little bit though.