The article is about China and TikTok’s behavior, not “the Kremlin”, and the behavior described in the article is mundane ad-buying. You can quite literally sift through the TikTok ad library yourself to confirm this. Instead you rely on vagueries and call people secret Kremlin agents who are very invested in changing your perspective, like a schizophrenic.
In the case of AfD and political polarization, that’s a problem on all platforms and has more to do with how algorithms and user engagement work.