Look close at the numbers. $36,500 per person per year across 64 million people.
If you are familiar with statistics, I'd like you to explain what it means to average out 64 million people.
How many of those are independently wealthy, or live off family wealth? How many work very few hours? How many work in industries with abusive hours? How many are rich, poor, middle class?
That article, and many like it, are incredibly misleading in how they throw around numbers. They involve combined statistics that cross millions of people across all industries and walks of life. GDP and other nationwide numbers are only marginally useful, mainly when comparing against similar marginally useful numbers for other overbroad international categories.
Then there is the issue of what it means, who was counted, and how it was counted. How the numbers are generated varies by location.
The actual hours you work per week and the actual value derived from it are unique to everyone.
For games software (and I happen to be in a position where I see lots of numbers) each individual contributor for a well-received project can easily hit $200K per year, $500+K per year for a popular title. That isn't the game developer's pay because it also goes to non-developers and to studio expenses; but per person each individual adds considerable value.
People who want to branch off and do their own thing can become independently wealthy and work less than 30 hours per week. It absolutely can be done. Read personal development sites like Steve Pavlina (who was in game development and is now a multi-millionare consultant on how smart people can get rich if they apply their brains).
Other people are less smart and end up working extremely hard, committing to 60, 70, or 80+ hour work weeks for very low wages.
The raw averages without other numbers is meaningless. Add in a bunch of outliers --- the rich families where people work 1-5 hours per week to maintain multi-million-dollar revenues, or the poor uneducated people who work 80+ hours at the minimum legal wage, those who work zero hours and bring in zero wages --- and the statistics get skewed quickly.