Let's see here people, this is very simple.
In the USA there is a process called "DMCA takedown" that is used to eliminate copyrighted code from public services. Sony cannot do anything under this process because they do not have the rights over any of the repos, now that none of the code hosted there is theirs. They say that the code violates other parts of the DMCA law (this is debatable), the "anti-copyright", but the process of "DMCA takedown" DOES NOT APPLY to these type of cases, only to the direct violations of copyright (for example, hosting an already compiled CFW on GitHub would be a valid case, and I have personally used the DMCA takedown process against scammers who sell the Homebrew Channel and distribute it in an illegal manner).
So, Sony sends a little letter, using the DMCA takedown template, making it look identical to a DMCA takedown, and with the text "DMCA takedown" on the subject line, but in reality it doesn't say what a DMCA takedown needs to say because they cannot say it (and if it alleges facts which are not true on the letter, judging them under penalty of perjury, their whole case would fall apart). And GitHub eats this all up.
GitHub gets scared, and since they aren't competent enough to determine what violates copyright or not, they just ignore it and pass the ball.
Now you have three options:
1. Send GitHub to hell and move to a service not hosted in the U.S. where there are no absurd laws and where the service won't swallow the legal bullshit that American corporations send, or
2. Send a DMCA counter-notice to GitHub alleging that, in fact, the code in the repos are not in violation of Sony copyrights, and swear to it under penalty of perjury, with your personal signature (electronic is also valid).
3. Re-upload the repos to the beast to give more per bag
If this was a real DMCA takedown, after doing #2, Sony has two choices: either shut up, in which case they cannot remove the repos again, or sue you personally
. Since it is not real, in reality it only serves so that GitHub feels that the resposibility is yours and theoretically. re-host your repo. Either way, if Sony wants to they will sue you anyways, that much is clear, so we shall see.
Disclaimer: this is my opinion, I am no lawyer, nor do I have any f*cking clue about this, nor is the above any sort of legal advice. Everyone judge for themselves.