First, the study was of Germans, who unlike Democrats, generally want to work, even the Left-wing ones.
Second, the German way of dealing with unemployment involves not just benefits like our unemployment compensation and generally broader social welfare benefits, but also making you look for work and can include being sent to retraining programs for other industries, where you get to start over at the bottom, which does involve more stress than staying at home binge-watching the ol' Fernseher.
They're pretty Socialist compared to the US, like all of Western Europe is, but they still have a work ethic and life expectations that are nothing like the Progs and the US welfare class.