Okay, so the light needs to be on. But of the nine cars remaining when I left, NONE of them had a body in them (at least not a live one in the front seat: don't know about what might have been in the trunk). There were 10 vehicles when I arrived, two spots are dead and coned off, there was a person in an X who left while I was charging, but no activity in the other nine at any point.
Just weird that this one is ALWAYS full or completely full. I have never seen more than two opens spaces on the app any time I have looked (and I look more than I should).