In general, accusing someone of being a shill is a poor move - even if you are right.

Instead I would encourage you to follow up with their comments and guide the argument back to it's basic facts - like that China is rounding up Muslims in camps and may be engaging in forced sterilization, and that allowing TikTok may not align with freedom.

Obviously don't spam or just blindly become a shill yourself, but just make the shilling activity do the opposite of what a shill might want.