That’s what someone said someone said. But if true it sounds like alcoholism. But nonetheless it sounds like focus during the day, get that over with then focus on socialising. Maybe this is deep work friendly.
I mean, when I worked at eBay in San Francisco, going around to bars after work -- more than once a week -- was the expected way to socialize with your coworkers. I didn't participate, but that meant I didn't connect to the rest of the team. I didn't find the idea that people in Germany do the same thing to be much of a stretch.