Obviously, nobody wants academics to be creating nonsense, and it would be wrong to deliberately create lies that are undetectable.In Academic circles the trust is implicit . . . . Academic freedom to be wrong comes with the absolute rule - you may not lie.
If I recall, they idea was to evaluate whether the peer-reviewers were able to detect hoaxes that should be able to be detected by a person with proper critical thinking skills (though I could be wrong about the exact methodology used).