Alright, I'm the one who said this, so I'll respond.
Some people have important questions, and they do not need to be followed by unnecessary messages. ExInfinity was asking a serious question. In my belief, if someone is serious, I am going to be serious as well. People in that thread were arguing and unnecessarily posting. So, I removed all of their messages said what you took a screenshot of above. I'm not sure how it was hard for a few select individuals to not post. I said don't post, so it's as simple as that. Well, they were not thinking all too well. After many unnecessary posts and ridiculous arguing, I had no choice but to ban them from replying to the thread.
The forum is a place to have fun. That's why all the fun is meant to happen in the Offtopic section. If someone is asking for help, no one needs to make the problem go off topic. If you want to have, be my guest, but do it in the Offtopic section ONLY.
Also, only staff members are allowed to tell people to stop posting in a thread. You can do it, but the players are not required to listen to you. However, if you have a legitimate question and post it in the correct forum section, you have the right to a direct answer. By this I mean if someone posts something totally unrelated in your help thread, the staff will remove that. If the thread goes out of hand (like the one I am referring to did), a staff member will say only the thread creator and other staff members are allowed to reply to the thread. If someone then posts after that, they will receive and warning and be banned from replying to that thread.
(Also, I am rushing out of my house, so sorry for any typos or unclear sentences.)