There is obviously some truth to this, but the number seem made up (+50% of people talking pictures of their food seems funny, but doesn't seem realistic.)
My gut feel is that this is a heavily tourist restaurant in NYC (maybe in a heavily tourist area like Times Square or Rockefeller Center).
A few giveaways: lots of people taking pictures of food. Lots of people taking pictures of each other. Requests for WiFi (international tourists who don't have data plans). Requests to take group pics.
They mentioned it was on July 3rd. Thats a holiday weekend, perhaps the % of patrons that weekend was exceedingly tourist and thus were more likely to "document" their NYC holiday vacation than patrons in, say, mid november.
