That's out of date, I believe. Nvidia went open source last year, though they did that by moving a lot of code from the drivers over to their firmware (in binary blob form).
https://developer.nvidia.com/blog/nvidia-releases-open-sourc...
https://developer.nvidia.com/blog/nvidia-releases-open-sourc...
From the repo readme[1], "GeForce and Workstation support is still considered alpha-quality."