For that one line, which other explanation do you have that better fits Occam's razor?
I would have a lot of trouble finding any other interpretation than him attempting to stop certain people from saying certain things and thus suppressing the discussion, whether successfully or not.
It's a reminder that freedom of speech != freedom from consequences. They're asking everyone to not ride on this infamous situation to perpetrate any more falsehood. Because if you do you'd have to help yourself with a little bit of law.
I would have a lot of trouble finding any other interpretation than him attempting to stop certain people from saying certain things and thus suppressing the discussion, whether successfully or not.