Came here to say basically this. I read that it used to be on the compound, but that it was separated out by a wall and made into a school some time ago - long enough that it means (if it’s true) we were using very outdated data, but you can apparently see on Google maps that it used to be part of the compound but now is outside the compound.

So a charitable interpretation is that we used outdated information to bomb what we thought was a military building. And of course there are less charitable interpretations.