The lilliput 7in VGA screen has never had flip screen ability hence why you can't find it in the manual either.
I believe this was duff info as the composite 7in liliput screens DO have this ability and hence most suppliers probably assumed that they would too. Most reputable suppliers have now updated their descriptions to not mention this anymore.
Its a pain as I also miss this feature as I have in my rear bumper a Sony bullet camera that doesn't reverse the image so well strange to over take someone and see them appear on the opposite side to what I over took them