From the information blurb on the page:
"The highest median income in absolute terms is earned by software engineers
in Switzerland (ratio 1.21) followed by Norway (81,400 USD) and the
United States ($76,000 USD). Norway has the highest GDP per capita (99,574 USD)
in this list with software engineers median income at about 82% of it."
Due to oil incomes and other stuff, Norway tends to be a serious outlier in many cases when it comes to economic metrics.