Your proof is typing 'propaganda on tiktok' into google?
Have you typed 'propaganda on hackernews' or on facebook/twitter/reddit or any other social media?
Everything in the world is going to have some form of propaganda to some degree. And honestly, having used tiktok a small amount, it seems way less than most social media out here. You generally have to even work hard to find anything that is political, most of it is completely random shit that has zero agenda.