He didn't technically fight in Kessler's backyard. They fought in Herning which is about as far from Copenhagen as you can get in Denmark. That's why they're comparing it to London and Nottingham. Because in Denmark that is what it is.
Herning is a promoter town, they've gotten Beyonce, Madonna and people like that to come so they're known for paying hefty site fees. So to say they fought in Kessler's backyard is not true. It's very expensive to travel from Copenhagen to Herning. You either have to fly, pay massive toll fees or pay $150 for a train ride.