I trust Ilya in his original decision, not in his retraction under intense pressure. Ilya has not changed his beliefs. Rather, he was unable to pay the price of those beliefs.
He will not even say the real reason that he, not the Board, fired Sam. If he has lost trust in Sam, he can no longer say so.
I also do not see why the board would endanger their already weak position by giving any courtesy notice to Microsoft, who has the best lawyers in the world and will move instantly.