No idea how you could know this. I have never seen any concrete evidence that there are propaganda videos interlaced into people’s feeds. Everything I have heard is hypothetical. “China could” do this or that. If there were anything more than conjecture it would be huge news.
Casey Newton said on Hard Fork that he started a new account recently as an experiment and didn’t mention anything about China propaganda videos.
The app's design is to get you to mindlessly doomscroll and not really think too hard about what it's showing you. If it shows you something insane occasionally it's no big deal, it's just the algorithm trying something new right?
It's very difficult to show any concrete evidence for how a secretive algorithm controlled by an adversary behaves. In an ideal world the burden should be on the platforms to prove that their algorithms are fair and not biasing towards certain viewpoints, but that might never happen.
I opened a new account in Canada last night due to the ban. I saw a lot of Canadian memes, and a ton of wildly incomprehensible foreign material from every corner of the globe as the algo tried to figure me out. But none of it looked remotely political or ideological in any way.
If there is propaganda it is very covert. Compared with X where my feed is maybe 80% overt propaganda, including from the owner of the platform himself.