Be that as it may, but the article you linked actually confirms that places like this exist all over the world: "Kaltluftlöcher wie jenes im ‚Bierchäller’ sind

Be that as it may, but the article you linked actually confirms that places like this exist all over the world: "Kaltluftlöcher wie jenes im ‚Bierchäller’ sind der Menschheit seit jeher bekannt und wurden überall genutzt" ("cold air holes like the one in the "Bierchäller" have been known for a long time and were used everywhere"). Because warm air rises up, cold air tends to accumulate in holes in the ground. That's how an ice cave can form in the not very high and not very cold mountains of Romania (https://en.wikipedia.org/wiki/Sc%C4%83ri%C8%99oara_Cave https://en.wikipedia.org/wiki/Sc%C4%83ri%C8%99oara_Cave). In Germany (particularly Bavaria), the ground above the beer cellars was planted with chestnut trees to provide shade and help keep the cellar cool during the summer. Which was also an excellent shady place to serve the beer. For the sake of simplicity, the customers were allowed to bring their own food - thus the Bavarian beer garden.