My bad, not sure how I got 222K. I don't get these numbers, if you assume it's for 9 employees, it's too high. If you assume it's for the 50 employees that they say they have, it's too low.
If we assume it's 50 people, that doesn't seem too crazy to me. That yields an average annual salary of $53k, which seems insane.
Remember that Buffer underpays their engineers and also has a lot of non-engineering employees.