This is a very realistic scenario. It doesn't mean people will suddenly see messages from the CCP on their screens. It could mean that posts that are critical of China are subtly downweighted (not banned, that would be too obvious and problematic) while those favorable towards China would be upweighted.
One thing the CCP is quite good at, from its long experience of always controlling the narrative in China, is this type of social media manipulation.
If they can't take the island quickly, then maybe propaganda helps. I just think neutering or nuking everyone's phones for a few days is enough to genuinely split the attention of the American people. I think it's very safe to say our culture cares much more about it's butter than it's guns right now. We are decadent.
along with details about how the US has no defensive alliance with taiwan, and that the US does not need to intervene