The article implies tens of millions being per month. $10m/500 people = $20k/person/month. That's a reasonable price estimate for a staff that big (considering tens could mean multiples more)
$250k annually per person just for downloading apps and using them is excessive to the point of unbelievable - That's a high tier developer salary, not app review pay. I would be surprised if these reviewers broke $50k, especially since the article mentions they're opening offices in other countries (with lower COL).
I agree, but when you factor in offices, equipment, utilities, benefits, healthcare, employment taxes, and corporate beaurocracy I think it gets pretty close.