It’s an Audi RS5 with an Abt Performance Tune and Abt Bodykit and rims.
RS5-R’s are special models built completely by ABT and given a specific number designation, they’re not just Customer cars that are brought in for tuning.
The German article you linked mentions it being a Customer order and not a bespoke model, the ABT page as well is for configuring an aftermarket tune (Power S or Power R level) for your normal Audi.
If you want to see something like this then I recommend voting on the RS5 topic: