[jrootabega]

Yes, and that is something that will always be possible between the author and the reader, but this is about a third party, GitHub, providing this information to a possible fourth party. That's what the Twitter post wanted to get across.

[chatmasta]

Oh right, I missed that because the post linked to the middle tweet in the thread.

Still doesn't sound too outrageous. At least, it's not unprecedented and is in line with the existing practices of companies responding to law enforcement requests.