The underlying logic of the reporting blaming Facebook for the Rohingya genocide is that Facebook somehow has more power than a totalitarian, genocidal military dictatorship. Given that assumption it's hard to see why we shouldn't also treat any restrictions they place on speech in the same way as we would a totalitarian government.

I disagree. I think the underlying logic of the reporting blaming Facebook is that it was used as a tool to foment hatred against the Rohingya minority in Myanmar. Both the statements “The Myanmar government is waging genocide against the Rohingya minority” and “Facebook doesn’t have a complete grasp of what its platform is being used to accomplish” can be true.