The way that I took it, when Mab snapped at Demonreach that Harry was hers to shape as she pleased, was that as long as Harry thought it was possible for her to do so, it WAS true. So Mab wasn't lying even though her statement was not empirically true.

ON another note, one thing that irked me was how, in Harry's remembering of the time Molly erased from his memory, Kincaid seemed not to remember that he had just heard from Harry several hours or a day or two ago. I have the audiobook so pinpointing the exact moment would take a while. Can anyone with the physical book provide the text for the phone calls from Changes and Ghost Story?