GP's point is not that only heroes should tell the tale, but rather that in this case the whistleblower was also an active part of the problem, but sought to distance herself from her then behavior by swapping it down instead for a more passive lack of situational awereness. That is, she reached for stupidity as an escape hatch from having to reckon with her own malice. And she's now being celebrated for it.

The lack of accountability paired with the celebration of the "hero" are the problem. Not the fact of her testimony.

EDIT: Some people who have similarly testified acknowledged the part they played in the situation they later denounced. So, it is possible for the story to be told and for the teller to also say "I knew what was up. I said nothing. I did nothing. I'm sorry."