You're all missing the point. Since they DID call it in (apparently) and he DID NOT pass the vetting process, then it would be reasonable to conclude that his GWCL should be revoked or suspended until the situation is cleared up because he no longer qualifies for it.
If he filled the form out incorrectly because he "thought" they'd never call it in or verify, then shame on him for being reckless in completing a required form that he, by his signature, attested to the accuracy of.
If he filled the form out incorrectly because he "thought" they'd never call it in or verify, then shame on him for being reckless in completing a required form that he, by his signature, attested to the accuracy of.