Remember that it's mandatory to disclose to visitors that your site uses Google Analytics in their T&C's https://www.google.com/analytics/terms/us.html (section 7, 'Privacy'). I don't see a privacy policy on this Google employee's page but perhaps they have a special exemption?

Anyhow, for many websites you'll get more accurate traffic data with GoAccess parsing your logs and showing you page views and basic demographic data. Use it alongside Google Analytics if you must, to see the exact difference between what Google tells you your page views were versus what your server tells you.