Yes, that functionality is at https://github.com/account/repositories . I think the problem here is that there's nothing (?) to prevent the user being re-added. The article does state a github employee showed Zed how to do this - no details though
There is nothing to block someone from doing it other than report them for abuse or get a different account and hope they don't find you.
The problem with reporting this as abuse though is the owner of the project wins his little lame-troll attempt. He got you to react, so he's all happy. The only way to really stop it is if people's whole accounts were removed from the site, but then they'd just go make another account and do it again.
Instead, they need to require a confirmation, and/or let you block projects. I prefer the confirmation because you can just ignore it and then nothing happens. A block would mean someone does it and then you have to do work to stop them.
