The operating temps of the coolant, and thus the oil, are regulated via a thermostat. The peak output of the engine only occurs during that peak.
I very much doubt a 200hp engine pushing a 3000 pound car through the air on a 100F day at 100 MPH is generating any more oil taxing situations than a 100hp engine doing the same thing, since in either case only ~50hp is being used anyway.
And the term "high horsepower" and "racing" are completely vague and ambiguous. VAG specs the same oil in a 2.0L 4 cyl moving a Crafter around, that has a payload that is more than a whole Golf weighs. THAT engine would be working harder potentially, wouldn't it?
The caveat is, where is the oil spec fall in relation to fuel economy and emissions vs. engine health and longevity?
We (this club, and others) have volumes upon volumes of experience to show that even some really heavily modified TDIs that get worked quite hard, or as hard as a road going car could/would ever see, are moving along just fine with stock OEM type motor oils. Not to mention the piles of UOA data collected.
So it really comes down to what exactly is being asked of the engine in the OP's car? It sounds to me (he did not say), that he is going to be using the engine in a car on the street, like 99% of us here are doing every day. And with the TDI, reduction or elimination of EGR as well as on the CR cars elimination of the DPF is already going to lessen the burden the motor oil has to carry. By a pretty big margin.