It's likely that the sentence wouldn't have been as harsh had there been evidence that he tried official channels first.
I frankly quite flatly don't believe the judge. The very fact that we know about so many of these crimes, which to my knowledge, none have been prosecuted shines the light of truth on this claim.
And sometimes, to call something like official whistleblowing channels the nonsense that they are, you imoly something very damaging about the whole system. I think it's too much to chew. And it's much easier to profess belief.
They'll ruin your life either way, at least this way the info makes a splash.
Working within the system to blow a whistle is... risky, you'll end up like Bill Binney, or Thomas Drake, and almost no one will hear about you.