"Mr. Altman’s departure follows a deliberative review process by the board, which concluded that he was not consistently candid in his communications with the board, hindering its ability to exercise its responsibilities."
And presumably this is why they used the "not consistently candid" weasel-wording. For that to be true, they only need to point to one material action that he didn't inform the board about (perhaps his chip startup, or Developer Day, or API access), and then point to the board meeting minutes, and then say "See, it's true. You did not inform us, the board, about these other actions you have taken, they matter to OpenAI's adherence to its mission, and therefore your inaction hindered our ability to exercise our responsibilities."
Everything else in the statement appears to be completely factual. It's a bad statement because it unnecessarily burns bridges and implies potential wrongdoing (because every other executive departure statement is so tame), but it didn't, strictly speaking, say anything untrue.
https://openai.com/blog/openai-announces-leadership-transiti...