It seems to me they are just singling out a single commit to be a problem, probably because of someone oversensitive complaining about this single commit, not knowing that github is full of what could be considered offensive to some. I am personally very happy we solved all world problems and now can focus on wording in commits.
I think making the subtitle of the project 'Webm for retards' might have something to do with it.
It's possible this project was reported by an offended user. If it is automated I expect other projects that use the word 'retard' as a project name or subtitle might have email notifications giving them some length of time to change or be banned.
https://github.com/search?utf8=%E2%9C%93&q=retard
It seems to me they are just singling out a single commit to be a problem, probably because of someone oversensitive complaining about this single commit, not knowing that github is full of what could be considered offensive to some. I am personally very happy we solved all world problems and now can focus on wording in commits.