This is quite the opposite. Every social media that is "palestine based" is censoring any other opinion that is contradict the palestine/Hamas narrative.

Try it yourself to put some post or even comment in /r/palestine , /r/chomsky Those are all controlled by brainwashed ISIS-supporter without any real attempt to real discussion about how to solve this situation.

He is saying Al Jazeera is not reliable. I.e maybe we should not believe their report about social media censorship.