I was asking about check-in, since my family would be coming from further away than they could return to the same night. They said it was the same procedure.I believe the situation you cited is only if you register a temp after already having checked in. I don't know what happens if you register a temp at check in.
It's pretty irrelevant to me, since I'm not going to travel if I have a fever that day, and it's unlikely I'd develop a fever out of the blue while enroute. No one in my immediate family is prone to random high temperatures, and I feel absolutely awful long before I reach the threshold being used.
However, if people are prone to fevers (and some are) or have a diagnosed medical condition that causes a fever (like a kid with an ear infection or a UTI) it sounds like they might have options available to them. I'd encourage anyone in that situation to ask what documentation is acceptable.