Unless one goes backwards through the checkpoint (WTMD and TDC), one usually has to go through the sterile area to get out of the checkpoint once in it. (Think DCA JuiceGate).
So I guess a TSO would have to escort someone out of the checkpoint into the sterile area and then to the exit of the sterile area in effect escorting them out of the sterile area.
You have to escort someone out of the checkpoint and then through a small part of the sterile area to get them to the exit at SAT. As Ari noted, we don't escort them "backwards" through the checkpoint. So again, and just guessing here, I think that was what Ron meant/said, and if so he didn't contradict himself.