The media is never completely silent about anything, but for many, many, many months it was very difficult to get any information at all about natural immunity from the media. I recall Googling around about it because everyone was talking about vaccination numbers and progress, but for the better part of a year, no one was talking about how many people had natural immunity much less how effective it is. Even if you're inclined to argue, "but what if no one knew the answers to those questions?"--first of all, it's unlikely that epidemiologists and virologists had no estimates at all, and even if they did, that itself would be newsworthy. Moreover, it's the media's job to dig up these answers.