Because of subduction.
What about them? What experiments? By whom? With what controls?
Most of the time when people talk about “experiments” on such matters they are starting from predetermined conclusions and a desire or need to believe and there’s nothing scientific going on at all. Just a standard con game. Preselected subjects / audience, specific-sounding questions or statements that are just statistically probable, and similar cold reading techniques.
Prophecy of the Biblical sort works roughly the same way. When I attended a Bible Institute in the Long Ago, they even taught me that prophecy was more “forth telling” than “fore telling” at the time it was given, and its fulfillment only made post hoc sense to those experiencing its “fulfillment”; you could even have partial or multiple fulfillments, plus figurative and literal ones. Which is just to say that Biblical prophecy is very vague and non-specific and eventually matches up with something that actually happens so that you can claim it was foretold.