He didn’t fail. He did what the board asked of him which proved to be more unpopular than they all had expected. So they gave him an obscenely generous severance package and sent him on his merry way.
He’s been rewarded and they’re just trying to position it so it looks like the company leadership gives a shit and won’t try the exact same thing at a later date.
If they design the process efficiently it shouldn’t burn too much battery to update the system image. The phone just needs to power up, connect to store wifi, apply the image and shut down. Doesn’t even need to power up the screen.