TLDR there's a claim that Altman was among other things distracted by OpenAI by the end of his tenure at YC and PG flew back to SF to deal with the situation. I

TLDR there's a claim that Altman was among other things distracted by OpenAI by the end of his tenure at YC and PG flew back to SF to deal with the situation. It's possible that PG didn't fire him but instead continued to play the role of mentor and told him things weren't going as well as they had before and that his advise was to choose between OpenAI and YC.