I'm extremely confused by this. It seems absurd that he could sign a letter seemingly demanding his own resignation, but also not resign? There must be some missing information.
Or possibly some misinformation. It does seem very strange, and more than a little confusing.
I have to keep reminding myself that information ultimately sourced from Twitter/X threads can't necessarily be taken at face value. Whatever the situation, I'm sure it will become clearer over the next few days.