A German Dude
He's not a 13:20 runner. He ran 7:34 - 13:12 - sub 28. That's quite a big difference. And he never ran 1:01. He ran 1:02low.
You're right. He only ever ran one HM though and that one was in NYC which is not necessarily the easiest race (hills, wind, time change from Europe etc.) also early in the season.