Don't know why it would leak there. Unless the leak is where they described the work should be done, and for some reason it travels along the side until it drips where you see it.
A valve cover leak should not be that hard to fix, unless something is bent (like the cover), or you have a marr on the head surface. Some manufacturers don't even provide you with a gasket - they expect you to simply create a silicone bead and then bolt the thing down over it. Maybe you should try a new cover gasket with a layer of silicone sealant?
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)