I dont think he called them up because while posting your accept/reject there's an option to choose Email/Phone/Website/Other and he chose Other. So I'm not sure what to conceive of it.
Just that it would be released by Feb end. But I noticed that somebody got an admit on 24th Feb! Check this out - http://thegradcafe.com/survey/index.php?q=mit+cdo&t=a&o=