To be honest I hate takes like yours, where people think that acknowledging a mistake (even a giant mistake) is a sign of weakness. A bigger sign of weakness in my opinion is people who commit to a shitty idea just because they said it first, despite all evidence to the contrary.
Regarding your last sentence, it's pretty obvious that if Altman comes back, the current board will effectively be neutered (it says as much in the article). So my guess is that they're more in "what do we do to save OpenAI as an organization" than saving their own roles.