I wonder if he's at the geographic center of his city or postcode. Sometimes a geocoding service will default to the center of an area if the address isn't precise enough or if it's using IP address based geocoding.
It doesn't say if the orders actually have his address on them or just show up.
Maybe the people ordering are using IE4 and too modern Javascript on the restaurants' site fail to return the correct address.
Luckily it's just pizza and not an artillery attack. I guess that'll happen soon enough, military bomber dropping a bomb in a wrong location because the soldier "ordering" the bombardment from the ground didn't update his app to the latest version...
It doesn't say if the orders actually have his address on them or just show up.
Approximately a small scale version of this: https://splinternews.com/how-an-internet-mapping-glitch-turn...