Exactly what I was thinking. Google, for one, likes to hire a lot of people under just two-three job descriptions. The author doesn't take any of that into acc

Exactly what I was thinking. Google, for one, likes to hire a lot of people under just two-three job descriptions. The author doesn't take any of that into account and it's not clear what the original analysts said, either — perhaps they compensated for this by calibrating numbers against historical employee headcount. Which is still broken, because, historically, Google had varying mixes of engineers vs. non-engineers, for example (but also: employees vs. contractors; lots could be said there).