According to APR's baseline test, the rs7 is underated by about 29 hp and 47 torque as received from the factory. This still doesn't diminish the 123 hp and 179 torque increase they achieve over the factory rating.
I know some cars only get 30ish from a tune (my old z06 for example).
The 2.0 TDI tune only nets 49 and 30 torque from APR.
See the graphs from goapr.com
The graph is showing the differenc between "stock" as measured not as claimed by audi.