Sounds like you are maintaining and extending your own frame of reference. I feel like a note that is never read again is not necessarily a wasted effort.
> Is trusting those sources really an acceptable basis for any autonomous individual to proceed?
You yourself are awefully fond of basing elaborate narratives on dubious sources, which is fine, but why then stoop to high-school debate club level gaslighting like "Ultimately, this is an epistemological question - what do we know? And the only things one can say one knows, is stuff you have personally verified.", unless this is satire?
No, they don't have such a right, but everyone has the right to call him out publicly. The key point, for me, is that vengeance is evil. Cheaters should be exposed but not destroyed. Go the full mile to get cheaters banned from competitions and make sure that the record is set straight. Make sure that past winnings and glory is returned and nullified, and leave it at that.