I think it could happen. As soon as he's in the government, they will decide that TikTok is illegal, and he'll either launch the clone or buy the US version from them.
I actually believe it's more likely than not.
Then the propaganda machine will include both Twitter and TikTok. You'll probably never see a fair election again in the US.
I've seen popular social media get banned. Again and again. It doesn't really lead to local alternatives gaining traction, it just leads to even a gramma knowing what a VPN is.