Only if this were considered conclusive (which it isn't) and if it weren't attempted first with an honest recounting of an actual memory (which they do).

I assume the true experience is done first to give a basis for comparison, since this is based on the idea that people paint pictures of their memories less reliably when they're fabricating them on the spot.

Having poorer recall actually might bias the results more in favor of a lie, if the interviewer doesn't reject the method as unsuitable or inconclusive first.