I can buy that they fired him over a disagreement about strategy (ie are we going too fast/we are concentrating on the wrong things etc), because in general of course board members get fired if they can't work together on a common strategy. But the narrative that has taken over lots of places at the weekend is more along the lines of he got fired because they had created a sentient AI and Ilya was worried about it. That just makes no sense to me.
Additionally, no-one (not insiders at OpenAI and certainly not a journalist) other than people in those conversations actually knows what happened, and noone other than Ilya actually knows why he did what he did. Everyone else is relying on rumor and heresay. For sure the closer people are to the matter the more insight they are likely to have, but noone who wasn't in the room actually knows.