Wow, that really obliterates two major assumptions I had about chess (1) that you can't win without 100% dedication to chess (2) that the skills are highly domain specific and not transferable.
I suppose you could say there are some skills from chess that are very transferable to something like managing a fantasy sports team; the ability to predict or prepare for certain outcomes and the ability to manage and minimize risk being two that come to mind.
It also helps that Carlsen is a football fan and has domain knowledge there that assist him in employing these skills.