If this guy wants to help the campaign (which he obviously still do) he should stop giving more interviews.
I'm not quite sure if I believe the Sanders campaign story, but that seems independent from the quality of the interview; even if you do, it shouldn't be a bad thing to ask more questions of individuals involved.
I think there are certainly some parallels as mentioned by the parent of the what constitutes a understanding of a breach vs ethics of accessing a system.
Well, if they didn't report, then we'd have more reason to doubt, no? Self-reporting deserves benefit of the doubt.
edit: Never mind my comment, now more clear on the situation.