Ouiji boards have been proven to be fraudulent. If, for example you blind fold the people placing their hands on the slider and give them a board with the letters mixed up they can’t spell anything. They are simply a subconscious wish fulfillment.
Notice, most occult activity falls into this category after all Satan is a liar but he is also a tyrant who doesn’t want to share power with anyone
Read NYers account. No hands on the planchette. Room temperature drops. Same with my wife’s experience.
Besides, it’s impossible to falsify every case because every case would have to be tested.
Such a claim entails substantiating proof. Please post some links to support your statement.