I don't think this is fully accurate. The big differentiator for Tik Tok's algorithmic feed from FB's or Youtube's (in my mind) is not its accuracy or lack of polarization, it's actually that it draws much firmer and harder to cross lines between the parts of its userbase with an (IMO intentionally) nerfed search capability, so it's very difficult to break out of the demographic/interest bubble it decides you are in for feed purposes. So you, personally, probably receive literally no polarizing, political, etc content that you aren't happy to see. But that doesn't mean it's not there!
Here's an example: a researcher set up a new account, interacted with transphobic content, and was very quickly (in a few hours of viewing) seeing far-right conspiracy theory, antisemitic, white supremacy (and so on) content, some of which was endorsing violence. https://twitter.com/abbieasr/status/1445888305997000705