It's why every single team in the pro sports "bubbles" has been listing their injured players as "unfit to play" instead of communicating about their injuries. They literally can't. If they say "knee injury" and then someone else is "unfit" then that's tacitly admitting the other person has COVID.
It's exactly the same thing that we are SUPPOSED to do as directors regarding ineligible students. We aren't supposed to say "Little Johnny is ineligible" because that's sharing his educational records (he failed a class!) - we're supposed to say something like "Johnny won't be with us at the game this week."