DU Reviews, Let's Plays, Gameplay Tips, And Builds

I know gamechangers played at sims camp, but were they only allowed to record and add commentary later on OR record commentary while recording? Cause watching Deligracys video, when she moves the cursor it looks like she’s moving the mouse, but they don’t have it yet because no patch!? Is it just good timing or did they all record commentary while recording at simscamps. I’m sorry if this is stupid but it’s really bugging me!