I doubt it will have any effect on his reputation at all.
He doesn't say Sam is innocent, heck he doesn't take sides at all.
He just writes about what he say without any judgement.
What specifically about the book do you think will may permanently ruin his reputation.
If you read a book that presented Elizabeth Holmes or Bernie Madoff in this way, what would be your perspective?
I don’t pretend to have the facts or know for certain of anyone’s sure guilt, but a lot of the evidence is awfully damning.
(For example) Michael Lewis strongly insinuated that SBF took calculated and justifiable risk when losing track of $X00M for months at a time
https://www.amazon.com/Going-Infinite-Rise-Fall-Tycoon/dp/B0...
Also I never read Flash Boys, but my understanding is that much of the anti-HFT/IEX crowd’s rhetoric has aged poorly especially as that industry has matured.