It is true, though not to the extremes I think you believe. I would guess that you're getting downvoted because you go from that to "Anything that is published in China, by definition is representative of the opinions of the Party." which is just patently not true (there is plenty of criticism of the CCP in both official published mediums - print, media, etc. - and even more so on blogs, weibo, etc.)

Lastly, your statement can also be applied to many western countries...