Do you recall where you saw this?
There are two types of topic timers: “Topic Timers”, and “User Topic Timers”. All timers can be used by staff (admin & moderators) as well as TL4 users. “Topic Timers” make a public change to the topic, for example opening/closing, changing category, or bumping. “User Topic Timers” set a reminder that only the user setting the timer can see.
For pre-creating weekly posts, you’re looking for the Schedule Publishing timer, which is a “Topic Timer”.