Did mentions of Tiananmen Square make China uncomfortable before 1989 or did that change? Did mentions of Winnie the Pooh make China uncomfortable before 2017 or did that change?
Chinese censorship is planned and targeted, with the intent to control and suppress dissent. It works hard to maintain a narrative and prevent excessive and rapid shifts so as to achieve a long term goal of control.
The billionaires running American social media (with a special shout to Musk) are mercurial and subject to the petty whims and feelings of the owner.
So while yes, obviously both change and the heads of the CCP are also occasionally subject to emotional responses, the differences between the two are stark and obvious. So no, "everything technically changes" is not a valid counter to the significant differences in intent and volatility.
Claiming you don't understand the point they were making is just being intentionally obtuse.
I'm sure your point was very clear in your head but it may not be obvious to you that other people can't read your mind. Suggesting that anyone who doesn't get your opaque point is being obtuse is arrogant and childish.
That was only two representative examples. Do you actually want me to make an exhaustive list of all of the changes that have happened over time to the Chinese censorship regime?
China censors all literature, film, music, and internet discourse employing advanced technologies and multiple tens of thousands of people while also running the world's largest prison for journalist. VPNs are blocked. Apps like Signal are blocked. Online gaming for minors is limited to 3 hours per day on weekends and holidays only. People get harassed by police for what they post online. Many go to jail for criticizing the government, spreading pornography or health related sexual content (including anything LGBT), supporting Taiwanese independence, or casting doubt on Chinese folk legends. Then, in addition to that (which I have not even begun to do justice to), all media companies run their own internal censorship regimes so as not to get in trouble with the authorities. And this rolls downhill: you the individual self-censor to not get in trouble with your boss or worse.
To the contrary... it's a real concern. That's why we shouldn't falsely equivocate the CCP censorship apparatus to the haphazard moderation impulses of a childish social media CEO.
We've got a lot more to lose, especially with the long-emerging (and currently accelerating) conflux of state and social media.