That article was debunked by Michael Hiltzik in the LA Times over a week ago:
No, the minimum wage isn't forcing these Seattle restaurants to close - LA Times. I also read another, slightly different, take-down of it somewhere else where they interviewed one of the restaurant owners who admitted to closing one restaurant but having plans to open another... just can't remember where I read it.
It's a sign of the times that news, particularly from right-leaning sources, is now more like propaganda. ALWAYS consider the source.