Let's be fair. All restaurants have their off days. Not all critics are always right. Often, reviewers take down famous places only so that they can shock readers and have their reviews read all over the world via social media.
I haven't been to the restaurant in question. So I don't know how fair the review is. But, as a general point, there is no denying that many famous and successful restaurants are content to sit back because they know that they will be full every day. The majority of them are reviewed once a year at best and usually not even that. A critic will review a great restaurant once and will then move on to newer openings.
That's why I admire the New York Times where the critics go back when they hear that standards have slipped. The Times is so fair and has so much credibility that a takedown (Le Cirque or Per Se) makes the whole world sit up and take notice without the critic having to write only for shock value.