If you really want to know what happened at Tiananmen in 1989, you can find a way to "jump the wall" and find out. It's just that most users aren't actively looking for alternatives to the propaganda statements, so their opinion on the state will be formed by enthusiastic reporting on the "belt and road" program or some other party-led initiative.
When that statement gained currency it was about being free to finally be outside of the cage that governments and large organizations made.
Today the old guard have built new tools - mass online commenting - to combat the signal itself.
So while the network may well reroute around censorship - the good censors just use the network to change the signal.
I've been on forums long enough now, and helped moderate enough To know the old naive version of free speech doesn't lead to the exchange of ideas.
It leads to the exhchange of whichever mind virus or meme is most capable of building reactions and structures in brains.
So it's definitely the era of subverting people and mass subversive speech/propaganda.
If I can press the right buttons in a person before you reach them with your facts/truth - what will you do?
That's the question I don't have an answer for just yet.
Now you can get any information if you want it and the problem is that propaganda still exists and some people still believe it.
It's not perfect but it's better.
And with the new tools, in particular the ability to sock puppet and impersonate human behavior in a context poor environment (you can't physical see the person, so can't make out if they are real or not, or body language and other factors we normally have during interaction).
So wouldn't it be fairer to say that they now have stronger control?
No civil war destroyed all records. No civil war spanning more then three generations. No locked in against foreigners syndrom.
If China does undergo civil and political upheaval I don't think it has the social institutions or mechanisms to suddenly switch to enlightened liberal democracy, history matters, but that doesn't mean the Communist Party is guaranteed political control in perpetuity.
It got pretty damned close in the Cultural Revolution.
China knows better than the west what powers can be exercised on the net.
They've been testing it for a long while and all the old assumptions "the net treats censorship as damage and routes around iT" etc. have been found wanting in China.
As the power of the nation state returns to ascendancy, now with IT firmly under its yoke, I suspect that China will do much better and succeed.
Instead - I think the west is going to end up following China in some format or the other.
Edit - as analogy: the market can remain irrational longmer than you can remain liquid.
Govt can suppress and succeed longer than you expect.