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The story was that Altman lied to specific board members to have other removed.

Where did you see this? Do you have any links?

Why didn't the board member(s) in question reveal the story in full when they had the chance?

I read it here on Hacker News. I dont have any links of it at hand, there were way too many threads about the drama for me to go looking for it now.

Cant answer your last question. As said, that was just the story that I heard here on HN.