This article made most of us Japanese laugh, I think. This columnist, who might be an American, also the editor in chief, didn't know the fact that in our country there is NO social custom of tipping at all?
Here in Japan the concept of "tip" is considered still very strange though many people know it from their travel experiences. I often feel the tip system is quite reasonable when I travel abroad but here in my own country we don't need it at all.
And I heard there are many other countries where people don't have the habit of tipping.
We tend to think that "our" social custom is not "ours" but the very universal one, but unfortunately it could be a mistake very often. And I'm afraid that this kind of small lack of the knowledge & understanding would cause the more serious misunderstanding, sometimes.
So, anyway, this is just a small funny episode but please, my Western friends, if you'd have the opportunity to visit Japan in near future, don't leave your tip money on restaurant table which would just confuse and sometimes trouble the waiters XD