I do not believe it is, as you posted your question. I went to PCGS photograde and looked at a Liberty
Walking half dollar. The words HALF DOLLAR are on top of the rock outcropping. The outcropping seems to be made in a way to highlight the words.
But the quarter dollar you are referring to goes across multiple devices, Washington's cape, coat, water and a couple of ice flows. None of which seemed to be modified to provide a distinct "place holder" for the words. Maybe that is why the coin seems different?