Yes, I made it up. Although I can imagine the converse, such as the Informatics room booking system, which is free positive — one objective of that calendar is that periods marked as free mean a room is definitely available.
I expect one can go on to identify a duality here, and formally demonstrate that people are not resources — which would be great, but probably overstretching things.
In the end, only we can decide whether or not
to believe what others choose to tell us.