Ah, nice. I was just looking through the github repo and found some config files for qt with color schemes. And yet my question stands: Why present a project like that?
Maybe it's good for live performances in darkened nightclubs.
Because the team is primarily developers, not designers? That's my best guess... its quite common amongst open source projects (although this is becoming increasingly rare).
The team is one person in this case. Project started in 1999.
Ze goggles, zey do nothing!
It's still weird to showcase a project with what is quite a strain to the eyes for most people.
Who knows, maybe the web team messed up with the image post processing step and coders aren't aware of the error yet.