I have a 2010 GTI, 100100 miles, and the only major thing I can say that I've done to my car that was a non-regular maintenance was getting the carbon build up on the valves cleaned up.
I had mine cleaned off at 80K miles. That may be the reason why they resealed the intake manifold twice before replacing the whole thing, although it should have only been done once. I didn't know that the intake manifold itself was an item that was fragile to begin with, but that may explain that annotation you see.
Overall though, solid car. I would buy another one.
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Man that's one sharp looking GTI! I dig those wheels