I tried it with a VPN running and in the Mullvad browser and it got all the big stuff wrong.

Where are you was sent to another location due to the VPN, this was all it really impacted. When you arrived was wrong because of the Mullvad browser, even without the VPN enabled it reports that I'm in Reykjavik, which I'm not. What you brought with you, it got the resolution wrong, as the browser locks itself to various resolutions to prevent this kind of fingerprinting. GPU and Battery both say "kept back", I assume this means it couldn't get anything, because when I run in Safari it says Apple GPU.