Indeed, it seems that github.com/docker/docker now redirects to this. From a technological perspective it's irrelevant, but from a brand management perspective it's baffling. Did they perceive the Docker brand as tainted in some way?
The Docker brand is "tainted" in the eyes of their commercial competitors who don't want to use shared tools/libraries.
By creating an independent project commercial actors in the Enterprise space can share resources, components, and standards without having to explain why they`re better than Docker even though they`re built on top of Docker.
This is a great move towards industry and container infrastructure orchestration standardization. Common APIs will go a long way to widespread container adoption.
It's not the brand that is tainted. People simply cannot trust their projects on someone else's commercial objectives. There is no indication this is changing.