He doesn’t need to defend himself. He can give a pablum report to the committee and reference his sorrow for the girl and link it to binge drinking as quoted in the yearbook. Parents and schools should play a better role in the proper development of young impressionable minds, realizing the lifetime mental issues that can be caused by binge drinking.
He’s already made an emphatic denial. No need to address any part of her story because if he does, that would open questions about what he knew about it.