Earlier quoted context omitted.
"Please do not spread further misinformation about the case." Let's assume that most people are giving their opinions to their best knowledge. We shall be careful when telling someone to stop spreading misinformation as this is how fascism starts. "I am right, you are wrong, stop talking!"
Even when people are giving their opinions to their best knowledge they can be spreading misinformation.
Calling everything that's at odds with ones beliefs misinformation is stupid in the first place. And I believe the word is used precisely in this sense most of the time. Definitely here.