I think what is happening is that the two different "schools" for elders are being confused here.
Every 3 years roughly there is a Kingdom Ministry Scool lasting about 2 days which takes place evrywhere at about the same time. It covers sttuff from the elders book, letters from the society and does indeed contain many videos these days. I think the next of these is at the end of this year.
There is also a "school" for congregation elders which is more like a pioneer school. Over several years the programme is delivered around the world to about 30 at a time. It lasts a full week, though I think it ends on friday lunchtime. It is supposed to be about building up and encouraging elders and training them to be better speakers. There is a lot of question and answer (KMS is mostly talks).but probably videos these days as well.