I believe you are correct. I don't use tiktok, but when someone shares a link with me the page says "XXX wanted you to see" and the url has no obvious query par

I believe you are correct. I don't use tiktok, but when someone shares a link with me the page says "XXX wanted you to see" and the url has no obvious query parameters so I can only assume they're bundling the video id with who shared it.