I still have a hard time believing such a thing is possible. I have a hard time believing these kinds of documentaries to begin with because they're mainly concerned with sensationalism and rarely give a balanced view of the issue. Secondly, there's no way to tell whether or not these "memories" are being fed to the child so that he "remembers" them. Now if he mentioned the conditions of starving to death in Ethiopia from the time he was first able to talk, you might have a more compelling case. But a Scottish boy recounting life in another part of Scotland doesn't seem to be that impressive.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.