Slightly different measurement, on their graph 20% of people made less than 10k/year and they list and use: $27,000 was the rounded median individual income in 2014. But, they are not measuring people on a salary.
Well, you weren't either so it seems fair. "1 in 20 people make over 200k / year" -> As you probably meant full income earners it would be interesting to see what it would be if measured actually for "people".
So, they may not be making 420k exclusively from their job, but 200+k / year is surprisingly common.