Sort of? Ultras are like... "This project isn't ideologically pure enough so it must stop. You should read more theory instead," and posties are like "This project will never succeed because capital has become too strong. You should go form a small commune instead, because that's the best you can hope for."

The mod in the pic is probably not an actual postie, because, even though they're Not My Favorite Tendency, they're still generally well-read and don't act like cops.