I suspect its pretty certain, it certainly held true when I was working there and that was before Google was 50K employees. The flip side though is you may not make it to 5 years. A lot of employees don't (which is less commonly talked about) but Google has always tried pretty hard to not retain people who weren't providing what they considered an appropriate level of contribution.
So if you start working at Google, and you make it to 5 years, then yes I'm sure you'll be making $250k+ total compensation.
I don't know if it is still true but there was a lot of data available during the 4 years I was there to watch this in "real time". Lots of data sources and a number of people interested in the question. You couldn't easily pull apart terms vs quits but at the end of the day it amounted to the same thing.
So if you start working at Google, and you make it to 5 years, then yes I'm sure you'll be making $250k+ total compensation.