This blog post is unlikely to contain TikTok's secret sauce, or even anything that is actually used by TikTok.

ByteDance runs TikTok, but they also sell recommendations as a service. The paper that this blog post is based on explicitly talks about that service in the abstract, and never even mentions TikTok.

Now, if I were to advertise a service that contains some of the ingredients of my other, very popular product, I would surely mention that fact ... but this is not the case here.