>> However, several current and former employees told TechCrunch that they believe Medium’s mass exodus is tied more to Williams’ manifesto, dubbed “the culture memo,”

I don't understand what that quote represents to you. Do you think the word "culture" necessarily refers to the 'culture war' kind? The word describes many other things, and corporate culture is a long-standing, well-known management concern.

> A perspective.

> You chose one of several from the article.

The effect on union activity seems to me to be by far the predominant reason presented.