There's no way of knowing if the magazine's report is on the money until Nintendo makes an official announcement -- after all, it's possible the article's mistaken, due entirely to the fact that March '11 looks a whole heck of a lot like March 11 on paper. Also, though Nintendo is accustomed to launching new gaming hardware in European territories on Fridays, those kinds of releases usually come stateside on Sundays. We've contacted Nintendo for a comment on this supposed due date but, as is the case with these things, we're not likely to get anything official until the Big N puts it into a press release.
Update: Some of the magazine's readers are reporting that the scan obtained by VGTribune was photoshopped, and that it did indeed read "March 2011." Another scan on GoNintendo shows the release timetable in its unaltered glory.