Most survivors question their memories at times.
This is a product of the dissociation that protected us from the trauma, as well as the conditioning, lies and lack of support in our past. It comes from a gradual body of experience, some of which is having moments when you do know from fully associated memory, and some of which comes from the body of knowledge you retrieve which cannot reasonably be explained any other way. This is a specious term which has been used to generally indict survivors seeking recovery.