Not very objective, since the operating systems were in unknown state, i.e. there was a third party antivirus installed on one Windows machine. In such conditions this benchmark doesn't provide any meaningful information.
Benchmarking typical environments vs artificially lean is much more helpful in practice.
Most machines were stock configured (Ubuntu ext4 install for Linux, Windows 10 w/ Windows Defender, macOS X stock install, etc), so I believe that they should be representative for average users.
The benchmark suite is open source and easy to run on your own hardware if you like to get more accurate/representative figures for a particular setup.