The ridiculous thing is the researchers not only don't know but they don't care because they never controlled for those factors and never even bothered to replicate their own experiment in different situations to explore the scope of applicability. Nor even replicate it in the same situation. It's as if they're trying to hide the truth from themselves because really they know it's a fraud and they'll only end up exposing the nothingness of their finding if they try too hard.