The definition of "shit post" varies from manager to manager. Even users in chipmixer are shitposters at times.(yea I said that)
I would not agree that any of the participants (current) in the CM campaign are shitposters because in that case they would be removed (as was the case in the past), and it would be easy to replace them with new members given the number of interested whenever 1 or 2 spots open.
The shit posting in this context isn't habitual as I understand. Some circumstances might make someone become a shit poster for a week, a day or even on a few number of posts. That quality isn't expected to be there always, especially when someone has nothing to contribute but is obliged to complete post quota.
It is not easy to be saying almost same thing for years, it's either you are bored or have nothing new to add. But this cannot be said of anyone with skills and deep knowledge of bitcoin and other cryptocurrencies.
Then, at some points, everyone's post would be below standard.