User blog comment:Sactage/Technical Update: August 28, 2012/@comment-3008849-20120831053351/@comment-4674838-20120831063349

I don't know anything about manually disabling blog commenting not working -- if that's the case, you should file a bug report to Special:Contact/bug about that one.

Edit: As for the js, in this edit you removed an essential line that needs to be there: function disableCommenting { If you put that line back in, it should work. (Make sure to clear your browser cache again)