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It looks for the label “smoke vent”, and follows the arrow
But seriously, there’s a good point that they’re expecting this to be covered with snow, and that’s probably critical to weather-sealing and insulating it, but why wouldn’t the vent also get covered?
Maybe they need to clear it off frequently? It also looks like the vent is just a hole in this image though, so nothing for snow to land in.
Maybe a fireplace is a better example, since a wood stove is more sealed off from the room it's in. I'll have to read about the chimney effect.
Why do they design it so that they have to crawl through a pool of freezing water to get in or out?