Yea it does say 80k, but when i went to get mine done at Midland VW, they had a letter on the wall stating that it should in fact be less than that and im sure that letter was from VW/Audi (one of the big companies)
At the end of the day its upto you, you can get it done at 80k (if it lasts that long), but as mentioned in my previous post the cost of doing this compared to repairing a snapped belt is alot less...
Also you have to remember that the manuals were made a while ago and since then alot of research has continually been made, not to mention people complaining as theirs had snapped, so as a precautionary they may have issued a statement saying to do them alot sooner, just to cover their backs.