I doubt too many restaurants where waiters were receiving significant tips are going to be telling their patrons that "tipping is not necessary". Hell, tipping is never "necessary" and I would resent anyone telling me that it was necessary for me to do so. I tip because it's the right thing to do.
Another iconic Seattle restaurant, Ivar’s Salmon House, also increased their menu prices to adjust to the rise in minimum wage. The message that appears on their menu now states: “Tipping is no longer necessary. The City of Seattle’s new minimum wage law went into effect on April 1, and we have changed the way we pay our employees.”
Just reporting that some are doing so...like this one...is it right, wrong, offensive? I don't care.