Thanks for sharing your experience Michael in that blog post. Can I read that "$200k paid in case" as in all paid off without loans even from family/friends? If so, $200k seems like a high saving amount considering average American household are in credit card debts. In other words, Google job did pay really well with RSUs and bonuses so that you can save up to buy house in one shot?
Doing so in just 4 years may be harder (again, depends on your spending), but if you have a little nest before then I don't see what's so strange about it.
As a privileged developer, this is an extremely untrue and privileged statement. Developers like myself who don't live in SF are lucky to receive any signing bonus, and would be lucky to earn half of that as a yearly salary. Outside the US it's not possible. You are part of a very small and very fortunate group.
Source: https://insights.stackoverflow.com/survey/2018/#salary
In that context, it's definitely priviledged but far from being extremely untrue.