What this means is that there is no mention of this in the public record of his Senate confirmation hearing.
The fact Feinstein never brought it up in the confirmation hearings, suggests that she thought it wasnt credible enough to pursue.
If were going to destroy a mans reputation, then let it be for something thaf he actually did do, not an allegation that wasnt even pursued with the authorities decades ago.
And Kavanaugh was a nobody in the 1980s. Nobody ever heard of him.