Maybe you should go to some sites and test to see whether Safe Browsing kicks in or not? Disable other extensions like uBO, netcraft etc. Can test at sites like Phishtank and OpenphishI downloaded it to confirm and Safe Browsing is disabled by default. I also left the browser running for an hour and used Fiddler to record the network traffic from first-run; it made no connection to any Google properties within that hour.
You can read his Win 64 version for Ungoogled Chromium below