I wouldn't count that as misinformation; it is sincere advocacy. A misinformation campaign would be organized by intelligency agency for the purpose of weakening another country.
A misinformation campaign is a campaign (=concerted communication effort) to spread misinformation.
Whether the people who spread it know it is in fact misinformation is a different discussion. Whether someone just fed into existing grievances in a clever way another one altogether.
Whether the people who spread it know it is in fact misinformation is a different discussion. Whether someone just fed into existing grievances in a clever way another one altogether.