Lots of countries have made it illegal to listen things like Radio Free Europe. I'm guessing you can't in North Korea. On the other hand, a US citizen that wants to get the Chinese perspective on anything has lots of ways to legally find that and repeat it. I am not saying a lot of people in the US are interested in a foreign point of view, or that the US doesn't have tons of propaganda. But I don't think you can convince anyone that the two countries treat speech the same way.