A few years ago, the Lemmy Developers decided to keep their political views on lemmygrad while keeping lemmy.ml more neutral. Now they are banning users who are critical of their actions and bigotry.
Anti-Tankie posts may put you at risk of being banned from commenting and posting on the lemmy.ml instance.
I had to dig a bit because Dessalines deleted the comments, but I found a screenshot. It references the Xinjiang genocide, not the Tiananmen Square massacre. Other users in the same thread were getting banned for discussing the Tiananmen Square massacre, but my ban was based on my comments about the Xinjiang genocide.