The U.S. government has not publicly presented any concrete evidence showing that TikTok has actually been used to influence US public opinion in line with CCP policy.
Wasn't there something about the algorithm pushing brainrot to US audiences while Chinese users got more educational/high quality content? Turning Americans stupid might count.
China is less interested in turning Americans into carriers of the red banner, and more interested in sowing political discord and instability. Just like Russia was doing in 2016, creating faux Bernie rallies and organizing them across the street from faux Trump rallies.