That is inaccurate. Your quote appears to be out of context. Where did you get it from? Here it is with more context from the Wikipedia page on the topic:
"For example, the JREF had
dowsers perform a control test, in which the dowser attempts to locate the target substance or object using their dowsing ability, even though the target's location has been revealed to the applicant. Failure to display a 100% success rate in the open test would cause their immediate disqualification. However, claimants were usually able to perform successfully during the open test, confirming that experimental conditions are adequate."
In other words that test applied only to dowsers. Who were shown the location of an object ahead of time. If they could not find the location of an object using dowsing where they already knew where it was that was an instant fail with dowsing. Does that still sound unfair?