A metaphor for Sweden's closeted gayness. Also we don't use the term "closet" in England, we tend to call it a wardrobe, or a built in wardrobe, so he clearly doesn't get the joke :p
Simo Häyhä was a Finnish sniper in WWII who, with over 700 kills in 105 days, can be thought of as the most deadly human in history. The Russians refered to him as The White Death.
Sweden is honestly one of my favorite Nordics, the other being Greenland because I can relate to the whole ' I ain't afraid of tha--OHSHNIKEYSI'MOUTBYE' thing.
Laughs, laughs, and the design of the cabinet is by the way not bad. It is worth saying that similar designs can be seen and ordered in Antonovich Design Service https://antonovich-design.ae/ This will help save a lot of time and nerves.