Sam Altman was CEO and President. The fact he was not Chairman is not material. There's a thousand different explanations how that misstatement could have occurred. Maybe someone wrote that up, and sama didn't review every single line, and other people just assumed it was right. But it's not material. Being being the CEO and President of YC is much, much more important and more material than Chairman of the board, which is largely a figurehead position.
No one is going to care and this is extreme nitpicking. They should fix the misstatement, but to claim some sort of conspiracy around this is stupid.