From their numbers, it doesn't matter much. Even if we take the highest number from their range ($175k) and double it, that is $3.5M/year for the 10-person team. That is still an order of magnitude less than $30M/year.
Depends on where you are. Cost of benefits doesn't really scale with geographical increases. In Boston, my last several startups have used 1.35x salary as the fully loaded cost for engineers.