Earlier quoted context omitted.
You are probably right; I just don't really see what's to be gained by going public with it considering the complaints are pretty inside-baseball and not that interesting to outsiders (I mean, hard to imagine someone thinking "I'm not going to deal with Google because so-and-so's subordinates say they don't understand her strategy").
I will certainly not use Dart if a person in charge of its direction doesn't know what they're doing even at a basic level. I can't just blindly hope her team does what's best and doesn't listen to her.
You might consider reading the followup post: https://ln.hixie.ch/?start=1700627532&count=1
It suggests that, in spite of his problems with management, the author remains bullish about Flutter (and likely Dart).