They made a fork of the dmca repository, and pushed the commit to their fork.
But Github uses the same single Git repository for all forks, and they have an issue where you can access a branch/commit of a fork from the main repository if you know its hash. They should probably fix that at some point.
> Github uses the same single Git repository for all forks
Ah I see, thanks for the explanation. I didn't know this was the case. I thought each fork would have its own `.git` folder. Seems like this approach could allow forkers to mess with the original repo, but maybe Git is designed in a way that this is mostly safe.
