I don't understand what you mean.

Should I update the instructions so something is more clear?

Also what is the other 20%?

> Should I update the instructions so something is more clear?

I believe they are referring to the "threads" link in the header of HN pages for an authenticated request. Can't say what the 20% is, of course. As for the 80%, it's a pull instead of a push but that page shows logged-in users their recent comments and the reply threads for them.