Honey, whose company puts snow-making machines in place for skiing and snowboarding events at the Olympics, says this isn't out of the ordinary. Around 80% of the snow at the 2014 Sochi Winter Olympics was man-made. "With the speeds they're doing and the responsiveness of their skits, it seems what they need is a more durable and better and consistent product on the mountain," Honey said.
Seoul tends to be dry in January and February, so it requires a little support from technology to get enough consistent snow for Olympic competition. The courses aren't likely to be at the quality Olympic athletes expect without the assistance of man-made snow.
It's not uncommon for ski resorts to use man-made snow as well. It can help stabilize the ski season when the snowpack is becoming increasingly unreliable in many areas. In fact, the skiing magazine Powder wrote, in an article about artificial snow, "It's easier to single out ski areas that don't use human-made snow as opposed to those that do." The magazine said in 2016 that almost 90% of ski resorts in North America use man-made snow to some extent.