I saw those tweets from Yglesias when he posted them; I didn't realise he'd deleted him.

To clarify: you say that Yglesias deleted his tweets "for clear reasons" - are the reasons really clear (e.g. Yglesias confirmed his reasons) or is that just your surmise? Also, you mention a private media Slack group but the tweet thread you linked doesn't say anything about a Slack group - is there another link where I can learn more about this?

I remember there was some other woke controversy at the NYT a couple of years ago where a private NYT Slack thread was leaked; I can only imagine the inner turmoil at the NYT given recent controversies (and an extra two years' worth of new, woke graduates entering the org.)