What conclusions can be drawn here? Either the LRL does not work (least likely), conditions are so horrible he couldn't find the gold (not very likely unless they had their high-powered metal detectors running nearby, in which case maybe the most likely issue), he doesn't know how to use it (can't say how likely), or all or any combination of the above. But to answer the question, no, he is wrong. The blanket generalizations are a sure sign.
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