Maybe we have different definitions of "the court of public opinion". Most people don't know who Sam Altman is, and most of the people who do know don't have strong opinions on his performance as OpenAI's CEO. Even on HN, the reaction to the board "skwer[ing] him" has been pretty mixed, and mostly one of confusion and waiting to see what else happens.
This quick a turnaround does make the board look bad, though.